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Docker下安装zookeeper(单机和集群)
服务器 2024/11/23 佚名
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启动Docker后，先看一下我们有哪些选择。

Docker下安装zookeeper(单机和集群)

有官方的当然选择官方啦~

下载：

[root@localhost admin]# docker pull zookeeper
Using default tag: latest
Trying to pull repository docker.io/library/zookeeper ...
latest: Pulling from docker.io/library/zookeeper
1ab2bdfe9778: Already exists
7aaf9a088d61: Pull complete
80a55c9c9fe8: Pull complete
a0086b0e6eec: Pull complete
4165e7457cad: Pull complete
bcba13bcf3a1: Pull complete
41c03a109e47: Pull complete
4d5281c6b0d4: Pull complete
Digest: sha256:175d6bb1471e1e37a48bfa41a9da047c80fade60fd585eae3a0e08a4ce1d39ed
Status: Downloaded newer image for docker.io/zookeeper:latest

查看镜像详情

[root@localhost admin]# docker images
REPOSITORY          TAG         IMAGE ID      CREATED       SIZE
192.168.192.128:443/hello-2  latest       0c24558dd388    42 hours ago    660 MB
192.168.192.128:443/hello   latest       a3ba3d430bed    42 hours ago    660 MB
docker.io/nginx        latest       5a3221f0137b    13 days ago     126 MB
docker.io/zookeeper      latest       3487af26dee9    13 days ago     225 MB
docker.io/registry      latest       f32a97de94e1    5 months ago    25.8 MB
docker.io/mongo        latest       8bf72137439e    12 months ago    380 MB
docker.io/influxdb      latest       34de2bdc2d7f    12 months ago    213 MB
docker.io/centos       latest       5182e96772bf    12 months ago    200 MB
docker.io/grafana/grafana   latest       3e16e05be9a3    13 months ago    245 MB
docker.io/hello-world     latest       2cb0d9787c4d    13 months ago    1.85 kB
docker.io/java        latest       d23bdf5b1b1b    2 years ago     643 MB
[root@localhost admin]# docker inspect 3487af26dee9
[
  {
    "Id": "sha256:3487af26dee9ef9eacee9a97521bc4f0243bef0b285247258c32f4a03cab92c5",
    "RepoTags": [
      "docker.io/zookeeper:latest"
    ],
    "RepoDigests": [
      "docker.io/zookeeper@sha256:175d6bb1471e1e37a48bfa41a9da047c80fade60fd585eae3a0e08a4ce1d39ed"
    ],
    "Parent": "",
    "Comment": "",
    "Created": "2019-08-15T06:10:50.178554969Z",
    "Container": "9a38467115f1952161d6075135d5c5287967282b834cfe68183339c810f9652b",
    "ContainerConfig": {
      "Hostname": "9a38467115f1",
      "Domainname": "",
      "User": "",
      "AttachStdin": false,
      "AttachStdout": false,
      "AttachStderr": false,
      "ExposedPorts": {
        "2181/tcp": {},
        "2888/tcp": {},
        "3888/tcp": {},
        "8080/tcp": {}
      },
      "Tty": false,
      "OpenStdin": false,
      "StdinOnce": false,
      "Env": [
        "PATH=/usr/local/openjdk-8/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/apache-zookeeper-3.5.5-bin/bin",
        "LANG=C.UTF-8",
        "JAVA_HOME=/usr/local/openjdk-8",
        "JAVA_VERSION=8u222",
        "JAVA_BASE_URL=https://github.com/AdoptOpenJDK/openjdk8-upstream-binaries/releases/download/jdk8u222-b10/OpenJDK8U-jre_",
        "JAVA_URL_VERSION=8u222b10",
        "ZOO_CONF_DIR=/conf",
        "ZOO_DATA_DIR=/data",
        "ZOO_DATA_LOG_DIR=/datalog",
        "ZOO_LOG_DIR=/logs",
        "ZOO_TICK_TIME=2000",
        "ZOO_INIT_LIMIT=5",
        "ZOO_SYNC_LIMIT=2",
        "ZOO_AUTOPURGE_PURGEINTERVAL=0",
        "ZOO_AUTOPURGE_SNAPRETAINCOUNT=3",
        "ZOO_MAX_CLIENT_CNXNS=60",
        "ZOO_STANDALONE_ENABLED=true",
        "ZOO_ADMINSERVER_ENABLED=true",
        "ZOOCFGDIR=/conf"
      ],
      "Cmd": [
        "/bin/sh",
        "-c",
        "#(nop) ",
        "CMD [\"zkServer.sh\" \"start-foreground\"]"
      ],
      "ArgsEscaped": true,
      "Image": "sha256:20bf3cc1bd5b5766b79da5265e94007d0802ce241df1636d0f63e211a79a0e3e",
      "Volumes": {
        "/data": {},
        "/datalog": {},
        "/logs": {}
      },
      "WorkingDir": "/apache-zookeeper-3.5.5-bin",
      "Entrypoint": [
        "/docker-entrypoint.sh"
      ],
      "OnBuild": null,
      "Labels": {}
    },
    "DockerVersion": "18.06.1-ce",
    "Author": "",
    "Config": {
      "Hostname": "",
      "Domainname": "",
      "User": "",
      "AttachStdin": false,
      "AttachStdout": false,
      "AttachStderr": false,
      "ExposedPorts": {
        "2181/tcp": {},
        "2888/tcp": {},
        "3888/tcp": {},
        "8080/tcp": {}
      },
      "Tty": false,
      "OpenStdin": false,
      "StdinOnce": false,
      "Env": [
        "PATH=/usr/local/openjdk-8/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/apache-zookeeper-3.5.5-bin/bin",
        "LANG=C.UTF-8",
        "JAVA_HOME=/usr/local/openjdk-8",
        "JAVA_VERSION=8u222",
        "JAVA_BASE_URL=https://github.com/AdoptOpenJDK/openjdk8-upstream-binaries/releases/download/jdk8u222-b10/OpenJDK8U-jre_",
        "JAVA_URL_VERSION=8u222b10",
        "ZOO_CONF_DIR=/conf",
        "ZOO_DATA_DIR=/data",
        "ZOO_DATA_LOG_DIR=/datalog",
        "ZOO_LOG_DIR=/logs",
        "ZOO_TICK_TIME=2000",
        "ZOO_INIT_LIMIT=5",
        "ZOO_SYNC_LIMIT=2",
        "ZOO_AUTOPURGE_PURGEINTERVAL=0",
        "ZOO_AUTOPURGE_SNAPRETAINCOUNT=3",
        "ZOO_MAX_CLIENT_CNXNS=60",
        "ZOO_STANDALONE_ENABLED=true",
        "ZOO_ADMINSERVER_ENABLED=true",
        "ZOOCFGDIR=/conf"
      ],
      "Cmd": [
        "zkServer.sh",
        "start-foreground"
      ],
      "ArgsEscaped": true,
      "Image": "sha256:20bf3cc1bd5b5766b79da5265e94007d0802ce241df1636d0f63e211a79a0e3e",
      "Volumes": {
        "/data": {},
        "/datalog": {},
        "/logs": {}
      },
      "WorkingDir": "/apache-zookeeper-3.5.5-bin",
      "Entrypoint": [
        "/docker-entrypoint.sh"
      ],
      "OnBuild": null,
      "Labels": null
    },
    "Architecture": "amd64",
    "Os": "linux",
    "Size": 225126346,
    "VirtualSize": 225126346,
    "GraphDriver": {
      "Name": "overlay2",
      "Data": {
        "LowerDir": "/var/lib/docker/overlay2/92185ebf7638a7b34180cfb87795dd758405cbad4fd0139b92a227d1a4b61847/diff:/var/lib/docker/overlay2/8787e91f5c03a7c03cee072019eca49a0402a0a0902be39ed0b5d651a79cce35/diff:/var/lib/docker/overlay2/ce5864ddfa4d1478047aa9fcaa03744e8a4078ebe43b41e7836c96c54c724044/diff:/var/lib/docker/overlay2/fc99437bcfbabb9e8234c06c90d1c60e58c34ac053aff1adc368b7ad3a50c158/diff:/var/lib/docker/overlay2/1779297a8980830229bd4bf58bd741730956d6797332fd07b863a1b48dcb6fa2/diff:/var/lib/docker/overlay2/ee735aa3608d890ac4751dd93581a67cb54a5dd4714081e9d09d0ebd9dbc3501/diff:/var/lib/docker/overlay2/cf6b3cbc42f3c8d1fb09b29db0dafbb4dceb120925970ab8a3871eaa8562414c/diff",
        "MergedDir": "/var/lib/docker/overlay2/a7fcc1b78c472cde943f20d1d4495f145308507b5fe3da8800c33dc4ce426156/merged",
        "UpperDir": "/var/lib/docker/overlay2/a7fcc1b78c472cde943f20d1d4495f145308507b5fe3da8800c33dc4ce426156/diff",
        "WorkDir": "/var/lib/docker/overlay2/a7fcc1b78c472cde943f20d1d4495f145308507b5fe3da8800c33dc4ce426156/work"
      }
    },
    "RootFS": {
      "Type": "layers",
      "Layers": [
        "sha256:1c95c77433e8d7bf0f519c9d8c9ca967e2603f0defbf379130d9a841cca2e28e",
        "sha256:2bf534399acac9c6b09a0b1d931223808000b04400a749f08187ed9ee435738d",
        "sha256:eb25e0278d41b9ac637d8cb2e391457cf44ce8d2bfe0646d0c9faefc96413f91",
        "sha256:e54bd3566d9ef3e1309a5af6caf8682f32c6ac4d6adfcbd3e601cfee4e2e0e85",
        "sha256:c79435051d529a7b86f5f9fc32e7e2ec401929434e5596f02a2af731f55c9f28",
        "sha256:76e0d7b2d700e6d17924b985703c7b5b84fb39ddcc0a1181b41217c2a11dffc4",
        "sha256:eecdc37df6afd77091641588f9639f63b65e8eb141e56529e00da44419c5bd04",
        "sha256:36e788f2d91a89375df5901f31cca33776f887c00ddfd3cf9f2466fa4cb794d6"
      ]
    }
  }
]

默认拉取最新的是3.5.X版本，如果你需要3.4.X版本的，要指定标签

Docker下安装zookeeper(单机和集群)

单机

# 最后那个是镜像的ID[root@localhost admin]# docker run -d -p 2181:2181 --name some-zookeeper --restart always 3487af26dee9
d5c6f857cd88c342acf63dd58e838a4cdf912daa6c8c0115091147136e819307
[root@localhost admin]# docker ps
CONTAINER ID    IMAGE        COMMAND         CREATED       STATUS       PORTS                         NAMES
d5c6f857cd88    3487af26dee9    "/docker-entrypoin..."  4 seconds ago    Up 3 seconds    2888/tcp, 3888/tcp, 0.0.0.0:2181->2181/tcp, 8080/tcp  some-zookeeper
[root@localhost admin]# docker exec -it d5c6f857cd88 bash
root@d5c6f857cd88:/apache-zookeeper-3.5.5-bin# ./bin/zkCli.sh
Connecting to localhost:2181
2019-08-29 07:15:21,623 [myid:] - INFO [main:Environment@109] - Client environment:zookeeper.version=3.5.5-390fe37ea45dee01bf87dc1c042b5e3dcce88653, built on 05/03/2019 12:07 GMT
2019-08-29 07:15:21,679 [myid:] - INFO [main:Environment@109] - Client environment:host.name=d5c6f857cd88
2019-08-29 07:15:21,680 [myid:] - INFO [main:Environment@109] - Client environment:java.version=1.8.0_222
2019-08-29 07:15:21,717 [myid:] - INFO [main:Environment@109] - Client environment:java.vendor=Oracle Corporation
2019-08-29 07:15:21,718 [myid:] - INFO [main:Environment@109] - Client environment:java.home=/usr/local/openjdk-8
2019-08-29 07:15:21,725 [myid:] - INFO [main:Environment@109] - Client environment:java.class.path=/apache-zookeeper-3.5.5-bin/bin/../zookeeper-server/target/classes:/apache-zookeeper-3.5.5-bin/bin/../build/classes:/apache-zookeeper-3.5.5-bin/bin/../zookeeper-server/target/lib/*.jar:/apache-zookeeper-3.5.5-bin/bin/../build/lib/*.jar:/apache-zookeeper-3.5.5-bin/bin/../lib/zookeeper-jute-3.5.5.jar:/apache-zookeeper-3.5.5-bin/bin/../lib/zookeeper-3.5.5.jar:/apache-zookeeper-3.5.5-bin/bin/../lib/slf4j-log4j12-1.7.25.jar:/apache-zookeeper-3.5.5-bin/bin/../lib/slf4j-api-1.7.25.jar:/apache-zookeeper-3.5.5-bin/bin/../lib/netty-all-4.1.29.Final.jar:/apache-zookeeper-3.5.5-bin/bin/../lib/log4j-1.2.17.jar:/apache-zookeeper-3.5.5-bin/bin/../lib/json-simple-1.1.1.jar:/apache-zookeeper-3.5.5-bin/bin/../lib/jline-2.11.jar:/apache-zookeeper-3.5.5-bin/bin/../lib/jetty-util-9.4.17.v20190418.jar:/apache-zookeeper-3.5.5-bin/bin/../lib/jetty-servlet-9.4.17.v20190418.jar:/apache-zookeeper-3.5.5-bin/bin/../lib/jetty-server-9.4.17.v20190418.jar:/apache-zookeeper-3.5.5-bin/bin/../lib/jetty-security-9.4.17.v20190418.jar:/apache-zookeeper-3.5.5-bin/bin/../lib/jetty-io-9.4.17.v20190418.jar:/apache-zookeeper-3.5.5-bin/bin/../lib/jetty-http-9.4.17.v20190418.jar:/apache-zookeeper-3.5.5-bin/bin/../lib/javax.servlet-api-3.1.0.jar:/apache-zookeeper-3.5.5-bin/bin/../lib/jackson-databind-2.9.8.jar:/apache-zookeeper-3.5.5-bin/bin/../lib/jackson-core-2.9.8.jar:/apache-zookeeper-3.5.5-bin/bin/../lib/jackson-annotations-2.9.0.jar:/apache-zookeeper-3.5.5-bin/bin/../lib/commons-cli-1.2.jar:/apache-zookeeper-3.5.5-bin/bin/../lib/audience-annotations-0.5.0.jar:/apache-zookeeper-3.5.5-bin/bin/../zookeeper-*.jar:/apache-zookeeper-3.5.5-bin/bin/../zookeeper-server/src/main/resources/lib/*.jar:/conf:
2019-08-29 07:15:22,108 [myid:] - INFO [main:Environment@109] - Client environment:java.library.path=/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib
2019-08-29 07:15:22,109 [myid:] - INFO [main:Environment@109] - Client environment:java.io.tmpdir=/tmp
2019-08-29 07:15:22,109 [myid:] - INFO [main:Environment@109] - Client environment:java.compiler=<NA>
2019-08-29 07:15:22,109 [myid:] - INFO [main:Environment@109] - Client environment:os.name=Linux
2019-08-29 07:15:22,109 [myid:] - INFO [main:Environment@109] - Client environment:os.arch=amd64
2019-08-29 07:15:22,110 [myid:] - INFO [main:Environment@109] - Client environment:os.version=3.10.0-862.9.1.el7.x86_64
2019-08-29 07:15:22,110 [myid:] - INFO [main:Environment@109] - Client environment:user.name=root
2019-08-29 07:15:22,110 [myid:] - INFO [main:Environment@109] - Client environment:user.home=/root
2019-08-29 07:15:22,110 [myid:] - INFO [main:Environment@109] - Client environment:user.dir=/apache-zookeeper-3.5.5-bin
2019-08-29 07:15:22,118 [myid:] - INFO [main:Environment@109] - Client environment:os.memory.free=11MB
2019-08-29 07:15:22,148 [myid:] - INFO [main:Environment@109] - Client environment:os.memory.max=247MB
2019-08-29 07:15:22,148 [myid:] - INFO [main:Environment@109] - Client environment:os.memory.total=15MB
2019-08-29 07:15:22,206 [myid:] - INFO [main:ZooKeeper@868] - Initiating client connection, connectString=localhost:2181 sessionTimeout=30000 watcher=org.apache.zookeeper.ZooKeeperMain$MyWatcher@3b95a09c
2019-08-29 07:15:22,239 [myid:] - INFO [main:X509Util@79] - Setting -D jdk.tls.rejectClientInitiatedRenegotiation=true to disable client-initiated TLS renegotiation
2019-08-29 07:15:22,285 [myid:] - INFO [main:ClientCnxnSocket@237] - jute.maxbuffer value is 4194304 Bytes
2019-08-29 07:15:22,366 [myid:] - INFO [main:ClientCnxn@1653] - zookeeper.request.timeout value is 0. feature enabled=
Welcome to ZooKeeper!
JLine support is enabled
2019-08-29 07:15:22,563 [myid:localhost:2181] - INFO [main-SendThread(localhost:2181):ClientCnxn$SendThread@1112] - Opening socket connection to server localhost/0:0:0:0:0:0:0:1:2181. Will not attempt to authenticate using SASL (unknown error)
2019-08-29 07:15:23,443 [myid:localhost:2181] - INFO [main-SendThread(localhost:2181):ClientCnxn$SendThread@959] - Socket connection established, initiating session, client: /0:0:0:0:0:0:0:1:37198, server: localhost/0:0:0:0:0:0:0:1:2181
2019-08-29 07:15:23,520 [myid:localhost:2181] - INFO [main-SendThread(localhost:2181):ClientCnxn$SendThread@1394] - Session establishment complete on server localhost/0:0:0:0:0:0:0:1:2181, sessionid = 0x10001216d990000, negotiated timeout = 30000
 
WATCHER::
 
WatchedEvent state:SyncConnected type:None path:null
[zk: localhost:2181(CONNECTED) 0] ls /
[zookeeper]
[zk: localhost:2181(CONNECTED) 1] quit
 
WATCHER::
 
WatchedEvent state:Closed type:None path:null
2019-08-29 07:15:37,042 [myid:] - INFO [main:ZooKeeper@1422] - Session: 0x10001216d990000 closed
2019-08-29 07:15:37,043 [myid:] - INFO [main-EventThread:ClientCnxn$EventThread@524] - EventThread shut down for session: 0x10001216d990000
root@d5c6f857cd88:/apache-zookeeper-3.5.5-bin# exit
exit
[root@localhost admin]#

在外部访问（192.168.192.128:2181）

Docker下安装zookeeper(单机和集群)

集群

环境：单台宿主机（192.168.192.128），启动三个zookeeper容器。

这里涉及一个问题，就是Docker容器之间通信的问题，这个很重要！

Docker下安装zookeeper(单机和集群)

Docker有三种网络模式，bridge、host、none，在你创建容器的时候，不指定--network默认是bridge。

bridge：为每一个容器分配IP，并将容器连接到一个docker0虚拟网桥，通过docker0网桥与宿主机通信。也就是说，此模式下，你不能用宿主机的IP+容器映射端口来进行Docker容器之间的通信。

host：容器不会虚拟自己的网卡，配置自己的IP，而是使用宿主机的IP和端口。这样一来，Docker容器之间的通信就可以用宿主机的IP+容器映射端口

none：无网络。

=====================================================

先在本地创建目录：

[root@localhost admin]# mkdir /usr/local/zookeeper-cluster
[root@localhost admin]# mkdir /usr/local/zookeeper-cluster/node1
[root@localhost admin]# mkdir /usr/local/zookeeper-cluster/node2
[root@localhost admin]# mkdir /usr/local/zookeeper-cluster/node3
[root@localhost admin]# ll /usr/local/zookeeper-cluster/
total 0
drwxr-xr-x. 2 root root 6 Aug 28 23:02 node1
drwxr-xr-x. 2 root root 6 Aug 28 23:02 node2
drwxr-xr-x. 2 root root 6 Aug 28 23:02 node3

然后执行命令启动

docker run -d -p 2181:2181 -p 2888:2888 -p 3888:3888 --name zookeeper_node1 --privileged --restart always -v /usr/local/zookeeper-cluster/node1/volumes/data:/data -v /usr/local/zookeeper-cluster/node1/volumes/datalog:/datalog -v /usr/local/zookeeper-cluster/node1/volumes/logs:/logs -e ZOO_MY_ID=1 -e "ZOO_SERVERS=server.1=192.168.192.128:2888:3888;2181 server.2=192.168.192.128:2889:3889;2182 server.3=192.168.192.128:2890:3890;2183" 3487af26dee9

docker run -d -p 2182:2181 -p 2889:2888 -p 3889:3888 --name zookeeper_node2 --privileged --restart always -v /usr/local/zookeeper-cluster/node2/volumes/data:/data -v /usr/local/zookeeper-cluster/node2/volumes/datalog:/datalog -v /usr/local/zookeeper-cluster/node2/volumes/logs:/logs -e ZOO_MY_ID=2 -e "ZOO_SERVERS=server.1=192.168.192.128:2888:3888;2181 server.2=192.168.192.128:2889:3889;2182 server.3=192.168.192.128:2890:3890;2183" 3487af26dee9

docker run -d -p 2183:2181 -p 2890:2888 -p 3890:3888 --name zookeeper_node3 --privileged --restart always -v /usr/local/zookeeper-cluster/node3/volumes/data:/data -v /usr/local/zookeeper-cluster/node3/volumes/datalog:/datalog -v /usr/local/zookeeper-cluster/node3/volumes/logs:/logs -e ZOO_MY_ID=3 -e "ZOO_SERVERS=server.1=192.168.192.128:2888:3888;2181 server.2=192.168.192.128:2889:3889;2182 server.3=192.168.192.128:2890:3890;2183" 3487af26dee9

【坑】

乍一看，没什么问题啊，首先映射端口到宿主机，然后三个zookeeper之间的访问地址则是宿主机IP:映射端口，没毛病啊；

看我前面讲的网络模式就能看出问题，ZOO_SERVERS里面的IP有问题，犯这个错误都是不了解Docker的网络模式的。什么错误往下看。

关于ZOO_SERVERS

Docker下安装zookeeper(单机和集群)

什么意思呢，3.5.0开始，不应该再使用clientPort和clientPortAddress配置参数。相反，这些信息现在是server关键字规范的一部分。

端口映射三个容器不一样，比如2181/2182/2183，因为是一台宿主机嘛，端口不能冲突，如果你不在同一台机器，就不用修改端口。

最后的那个参数是镜像ID，也可以是镜像名称:TAG。

--privileged=true参数是为了解决【chown: changing ownership of '/data': Permission denied】，也可以省略true

执行结果：

[root@localhost admin]# docker run -d -p 2181:2181 -p 2888:2888 -p 3888:3888 --name zookeeper_node1 --privileged --restart always > -v /usr/local/zookeeper-cluster/node1/volumes/data:/data > -v /usr/local/zookeeper-cluster/node1/volumes/datalog:/datalog > -v /usr/local/zookeeper-cluster/node1/volumes/logs:/logs > -e ZOO_MY_ID=1 > -e "ZOO_SERVERS=server.1=192.168.192.128:2888:3888;2181 server.2=192.168.192.128:2889:3889;2182 server.3=192.168.192.128:2890:3890;2183" 3487af26dee9
4bfa6bbeb936037e178a577e5efbd06d4a963e91d67274413b933fd189917776
[root@localhost admin]# docker run -d -p 2182:2181 -p 2889:2888 -p 3889:3888 --name zookeeper_node2 --privileged --restart always > -v /usr/local/zookeeper-cluster/node2/volumes/data:/data > -v /usr/local/zookeeper-cluster/node2/volumes/datalog:/datalog > -v /usr/local/zookeeper-cluster/node2/volumes/logs:/logs > -e ZOO_MY_ID=2 > -e "ZOO_SERVERS=server.1=192.168.192.128:2888:3888;2181 server.2=192.168.192.128:2889:3889;2182 server.3=192.168.192.128:2890:3890;2183" 3487af26dee9
dbb7f1f323a09869d043152a4995e73bad5f615fd81bf11143fd1c28180f9869
[root@localhost admin]# docker run -d -p 2183:2181 -p 2890:2888 -p 3890:3888 --name zookeeper_node3 --privileged --restart always > -v /usr/local/zookeeper-cluster/node3/volumes/data:/data > -v /usr/local/zookeeper-cluster/node3/volumes/datalog:/datalog > -v /usr/local/zookeeper-cluster/node3/volumes/logs:/logs > -e ZOO_MY_ID=3 > -e "ZOO_SERVERS=server.1=192.168.192.128:2888:3888;2181 server.2=192.168.192.128:2889:3889;2182 server.3=192.168.192.128:2890:3890;2183" 3487af26dee9
6dabae1d92f0e861cc7515c014c293f80075c2762b254fc56312a6d3b450a919
[root@localhost admin]#

查看启动的容器

[root@localhost admin]# docker ps
CONTAINER ID    IMAGE        COMMAND         CREATED       STATUS       PORTS                                       NAMES
6dabae1d92f0    3487af26dee9    "/docker-entrypoin..."  31 seconds ago   Up 29 seconds    8080/tcp, 0.0.0.0:2183->2181/tcp, 0.0.0.0:2890->2888/tcp, 0.0.0.0:3890->3888/tcp  zookeeper_node3
dbb7f1f323a0    3487af26dee9    "/docker-entrypoin..."  36 seconds ago   Up 35 seconds    8080/tcp, 0.0.0.0:2182->2181/tcp, 0.0.0.0:2889->2888/tcp, 0.0.0.0:3889->3888/tcp  zookeeper_node2
4bfa6bbeb936    3487af26dee9    "/docker-entrypoin..."  46 seconds ago   Up 45 seconds    0.0.0.0:2181->2181/tcp, 0.0.0.0:2888->2888/tcp, 0.0.0.0:3888->3888/tcp, 8080/tcp  zookeeper_node1
[root@localhost admin]#

不是说有错误吗？怎么还启动成功了？？我们来看下节点1的启动日志

[root@localhost admin]# docker logs -f 4bfa6bbeb936
ZooKeeper JMX enabled by default

...

2019-08-29 09:20:22,665 [myid:1] - WARN [WorkerSender[myid=1]:QuorumCnxManager@677] - Cannot open channel to 2 at election address /192.168.192.128:3889
java.net.ConnectException: Connection refused (Connection refused)
  at java.net.PlainSocketImpl.socketConnect(Native Method)
  at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
  at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
  at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
  at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
  at java.net.Socket.connect(Socket.java:589)
  at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:648)
  at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:705)
  at org.apache.zookeeper.server.quorum.QuorumCnxManager.toSend(QuorumCnxManager.java:618)
  at org.apache.zookeeper.server.quorum.FastLeaderElection$Messenger$WorkerSender.process(FastLeaderElection.java:477)
  at org.apache.zookeeper.server.quorum.FastLeaderElection$Messenger$WorkerSender.run(FastLeaderElection.java:456)
  at java.lang.Thread.run(Thread.java:748)
2019-08-29 09:20:22,666 [myid:1] - WARN [WorkerSender[myid=1]:QuorumCnxManager@677] - Cannot open channel to 3 at election address /192.168.192.128:3890
java.net.ConnectException: Connection refused (Connection refused)
  at java.net.PlainSocketImpl.socketConnect(Native Method)
  at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
  at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
  at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
  at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
  at java.net.Socket.connect(Socket.java:589)
  at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:648)
  at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:705)
  at org.apache.zookeeper.server.quorum.QuorumCnxManager.toSend(QuorumCnxManager.java:618)
  at org.apache.zookeeper.server.quorum.FastLeaderElection$Messenger$WorkerSender.process(FastLeaderElection.java:477)
  at org.apache.zookeeper.server.quorum.FastLeaderElection$Messenger$WorkerSender.run(FastLeaderElection.java:456)
  at java.lang.Thread.run(Thread.java:748)

连接不上2 和 3，为什么呢，因为在默认的Docker网络模式下，通过宿主机的IP+映射端口，根本找不到啊！他们有自己的IP啊！如下：

[root@localhost admin]# docker ps
CONTAINER ID    IMAGE        COMMAND         CREATED       STATUS       PORTS                                       NAMES
6dabae1d92f0    3487af26dee9    "/docker-entrypoin..."  5 minutes ago    Up 5 minutes    8080/tcp, 0.0.0.0:2183->2181/tcp, 0.0.0.0:2890->2888/tcp, 0.0.0.0:3890->3888/tcp  zookeeper_node3
dbb7f1f323a0    3487af26dee9    "/docker-entrypoin..."  6 minutes ago    Up 6 minutes    8080/tcp, 0.0.0.0:2182->2181/tcp, 0.0.0.0:2889->2888/tcp, 0.0.0.0:3889->3888/tcp  zookeeper_node2
4bfa6bbeb936    3487af26dee9    "/docker-entrypoin..."  6 minutes ago    Up 6 minutes    0.0.0.0:2181->2181/tcp, 0.0.0.0:2888->2888/tcp, 0.0.0.0:3888->3888/tcp, 8080/tcp  zookeeper_node1


[root@localhost admin]# docker inspect 4bfa6bbeb936
      "Networks": {
        "bridge": {
          "IPAMConfig": null,
          "Links": null,
          "Aliases": null,
          "NetworkID": "5fc1ce4362afe3d34fdf260ab0174c36fe4b7daf2189702eae48101a755079f3",
          "EndpointID": "368237e4c903cc663111f1fe33ac4626a9100fb5a22aec85f5eccbc6968a1631",
          "Gateway": "172.17.0.1",
          "IPAddress": "172.17.0.2",
          "IPPrefixLen": 16,
          "IPv6Gateway": "",
          "GlobalIPv6Address": "",
          "GlobalIPv6PrefixLen": 0,
          "MacAddress": "02:42:ac:11:00:02"
        }
      }
    }
  }
]

[root@localhost admin]# docker inspect dbb7f1f323a0
      "Networks": {
        "bridge": {
          "IPAMConfig": null,
          "Links": null,
          "Aliases": null,
          "NetworkID": "5fc1ce4362afe3d34fdf260ab0174c36fe4b7daf2189702eae48101a755079f3",
          "EndpointID": "8a9734044a566d5ddcd7cbbf6661abb2730742f7c73bd8733ede9ed8ef106659",
          "Gateway": "172.17.0.1",
          "IPAddress": "172.17.0.3",
          "IPPrefixLen": 16,
          "IPv6Gateway": "",
          "GlobalIPv6Address": "",
          "GlobalIPv6PrefixLen": 0,
          "MacAddress": "02:42:ac:11:00:03"
        }
      }
    }
  }
]

[root@localhost admin]# docker inspect 6dabae1d92f0
      "Networks": {
        "bridge": {
          "IPAMConfig": null,
          "Links": null,
          "Aliases": null,
          "NetworkID": "5fc1ce4362afe3d34fdf260ab0174c36fe4b7daf2189702eae48101a755079f3",
          "EndpointID": "b10329b9940a07aacb016d8d136511ec388de02bf3bd0e0b50f7f4cbb7f138ec",
          "Gateway": "172.17.0.1",
          "IPAddress": "172.17.0.4",
          "IPPrefixLen": 16,
          "IPv6Gateway": "",
          "GlobalIPv6Address": "",
          "GlobalIPv6PrefixLen": 0,
          "MacAddress": "02:42:ac:11:00:04"
        }
      }
    }
  }
]

node1---172.17.0.2
node2---172.17.0.3
node3---172.17.0.4

既然我们知道了它有自己的IP，那又出现另一个问题了，就是它的ip是动态的，启动之前我们无法得知。有个解决办法就是创建自己的bridge网络，然后创建容器的时候指定ip。

【正确方式开始】

[root@localhost admin]# docker network create --driver bridge --subnet=172.18.0.0/16 --gateway=172.18.0.1 zoonet
8257c501652a214d27efdf5ef71ff38bfe222c3a2a7898be24b8df9db1fb3b13
[root@localhost admin]# docker network ls
NETWORK ID     NAME        DRIVER       SCOPE
5fc1ce4362af    bridge       bridge       local
6aa33e21444e    host        host        local
20e563b93ce9    none        null        local
8257c501652a    zoonet       bridge       local
[root@localhost admin]# docker network inspect 8257c501652a
[
  {
    "Name": "zoonet",
    "Id": "8257c501652a214d27efdf5ef71ff38bfe222c3a2a7898be24b8df9db1fb3b13",
    "Created": "2019-08-29T06:08:01.442601483-04:00",
    "Scope": "local",
    "Driver": "bridge",
    "EnableIPv6": false,
    "IPAM": {
      "Driver": "default",
      "Options": {},
      "Config": [
        {
          "Subnet": "172.18.0.0/16",
          "Gateway": "172.18.0.1"
        }
      ]
    },
    "Internal": false,
    "Attachable": false,
    "Containers": {},
    "Options": {},
    "Labels": {}
  }
]

然后我们修改一下zookeeper容器的创建命令。

docker run -d -p 2181:2181 --name zookeeper_node1 --privileged --restart always --network zoonet --ip 172.18.0.2 -v /usr/local/zookeeper-cluster/node1/volumes/data:/data -v /usr/local/zookeeper-cluster/node1/volumes/datalog:/datalog -v /usr/local/zookeeper-cluster/node1/volumes/logs:/logs -e ZOO_MY_ID=1 -e "ZOO_SERVERS=server.1=172.18.0.2:2888:3888;2181 server.2=172.18.0.3:2888:3888;2181 server.3=172.18.0.4:2888:3888;2181" 3487af26dee9

docker run -d -p 2182:2181 --name zookeeper_node2 --privileged --restart always --network zoonet --ip 172.18.0.3 -v /usr/local/zookeeper-cluster/node2/volumes/data:/data -v /usr/local/zookeeper-cluster/node2/volumes/datalog:/datalog -v /usr/local/zookeeper-cluster/node2/volumes/logs:/logs -e ZOO_MY_ID=2 -e "ZOO_SERVERS=server.1=172.18.0.2:2888:3888;2181 server.2=172.18.0.3:2888:3888;2181 server.3=172.18.0.4:2888:3888;2181" 3487af26dee9

docker run -d -p 2183:2181 --name zookeeper_node3 --privileged --restart always --network zoonet --ip 172.18.0.4 -v /usr/local/zookeeper-cluster/node3/volumes/data:/data -v /usr/local/zookeeper-cluster/node3/volumes/datalog:/datalog -v /usr/local/zookeeper-cluster/node3/volumes/logs:/logs -e ZOO_MY_ID=3 -e "ZOO_SERVERS=server.1=172.18.0.2:2888:3888;2181 server.2=172.18.0.3:2888:3888;2181 server.3=172.18.0.4:2888:3888;2181" 3487af26dee9

1. 由于2888 、3888不需要暴露，就不映射了；

2. 指定自己的网络，并指定IP；

3. 每个容器之间环境是隔离的，所以容器内所用的端口一样：2181/2888/3888

Docker下安装zookeeper(单机和集群)

运行结果：

[root@localhost admin]# docker run -d -p 2181:2181 --name zookeeper_node1 --privileged --restart always --network zoonet --ip 172.18.0.2 > -v /usr/local/zookeeper-cluster/node1/volumes/data:/data > -v /usr/local/zookeeper-cluster/node1/volumes/datalog:/datalog > -v /usr/local/zookeeper-cluster/node1/volumes/logs:/logs > -e ZOO_MY_ID=1 > -e "ZOO_SERVERS=server.1=172.18.0.2:2888:3888;2181 server.2=172.18.0.3:2888:3888;2181 server.3=172.18.0.4:2888:3888;2181" 3487af26dee9
50c07cf11fab2d3b4da6d8ce48d8ed4a7beaab7d51dd542b8309f781e9920c36
[root@localhost admin]# docker run -d -p 2182:2181 --name zookeeper_node2 --privileged --restart always --network zoonet --ip 172.18.0.3 > -v /usr/local/zookeeper-cluster/node2/volumes/data:/data > -v /usr/local/zookeeper-cluster/node2/volumes/datalog:/datalog > -v /usr/local/zookeeper-cluster/node2/volumes/logs:/logs > -e ZOO_MY_ID=2 > -e "ZOO_SERVERS=server.1=172.18.0.2:2888:3888;2181 server.2=172.18.0.3:2888:3888;2181 server.3=172.18.0.4:2888:3888;2181" 3487af26dee9
649a4dbfb694504acfe4b8e11b990877964477bb41f8a230bd191cba7d20996f
[root@localhost admin]# docker run -d -p 2183:2181 --name zookeeper_node3 --privileged --restart always --network zoonet --ip 172.18.0.4 > -v /usr/local/zookeeper-cluster/node3/volumes/data:/data > -v /usr/local/zookeeper-cluster/node3/volumes/datalog:/datalog > -v /usr/local/zookeeper-cluster/node3/volumes/logs:/logs > -e ZOO_MY_ID=3 > -e "ZOO_SERVERS=server.1=172.18.0.2:2888:3888;2181 server.2=172.18.0.3:2888:3888;2181 server.3=172.18.0.4:2888:3888;2181" 3487af26dee9
c8bc1b9ae9adf86e9c7f6a3264f883206c6d0e4f6093db3200de80ef39f57160
[root@localhost admin]# docker ps
CONTAINER ID    IMAGE        COMMAND         CREATED       STATUS       PORTS                         NAMES
c8bc1b9ae9ad    3487af26dee9    "/docker-entrypoin..."  17 seconds ago   Up 16 seconds    2888/tcp, 3888/tcp, 8080/tcp, 0.0.0.0:2183->2181/tcp  zookeeper_node3
649a4dbfb694    3487af26dee9    "/docker-entrypoin..."  22 seconds ago   Up 21 seconds    2888/tcp, 3888/tcp, 8080/tcp, 0.0.0.0:2182->2181/tcp  zookeeper_node2
50c07cf11fab    3487af26dee9    "/docker-entrypoin..."  33 seconds ago   Up 32 seconds    2888/tcp, 3888/tcp, 0.0.0.0:2181->2181/tcp, 8080/tcp  zookeeper_node1
[root@localhost admin]#

进入容器内部验证一下：

[root@localhost admin]# docker exec -it 50c07cf11fab bash
root@50c07cf11fab:/apache-zookeeper-3.5.5-bin# ./bin/zkServer.sh status
ZooKeeper JMX enabled by default
Using config: /conf/zoo.cfg
Client port found: 2181. Client address: localhost.
Mode: follower
root@50c07cf11fab:/apache-zookeeper-3.5.5-bin# exit
exit
[root@localhost admin]# docker exec -it 649a4dbfb694 bash
root@649a4dbfb694:/apache-zookeeper-3.5.5-bin# ./bin/zkServer.sh status
ZooKeeper JMX enabled by default
Using config: /conf/zoo.cfg
Client port found: 2181. Client address: localhost.
Mode: leader
root@649a4dbfb694:/apache-zookeeper-3.5.5-bin# exit
exit
[root@localhost admin]# docker exec -it c8bc1b9ae9ad bash
root@c8bc1b9ae9ad:/apache-zookeeper-3.5.5-bin# ./bin/zkServer.sh status
ZooKeeper JMX enabled by default
Using config: /conf/zoo.cfg
Client port found: 2181. Client address: localhost.
Mode: follower
root@c8bc1b9ae9ad:/apache-zookeeper-3.5.5-bin# exit
exit
[root@localhost admin]#

在验证一下创建节点

Docker下安装zookeeper(单机和集群)

开启防火墙，以供外部访问

firewall-cmd --zone=public --add-port=2181/tcp --permanent
firewall-cmd --zone=public --add-port=2182/tcp --permanent
firewall-cmd --zone=public --add-port=2183/tcp --permanent
systemctl restart firewalld
firewall-cmd --list-all

在本地，我用zookeeper的客户端连接虚拟机上的集群：

Docker下安装zookeeper(单机和集群)

可以看到连接成功！

Docker下安装zookeeper(单机和集群)

集群安装方式二：通过docker stack deploy或docker-compose安装

这里用docker-compose。先安装docker-compose

[root@localhost admin]# curl -L "https://github.com/docker/compose/releases/download/1.24.1/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose
 % Total  % Received % Xferd Average Speed  Time  Time   Time Current
                 Dload Upload  Total  Spent  Left Speed
100  617  0  617  0   0  145   0 --:--:-- 0:00:04 --:--:--  145
100 15.4M 100 15.4M  0   0  131k   0 0:02:00 0:02:00 --:--:-- 136k
[root@localhost admin]# chmod +x /usr/local/bin/docker-compose

检查版本（验证是否安装成功）

[root@localhost admin]# docker-compose --version
docker-compose version 1.24.1, build 4667896b

卸载的话

rm /usr/local/bin/docker-compose

开始配置，新建三个挂载目录

[root@localhost admin]# mkdir /usr/local/zookeeper-cluster/node4
[root@localhost admin]# mkdir /usr/local/zookeeper-cluster/node5
[root@localhost admin]# mkdir /usr/local/zookeeper-cluster/node6

新建任意目录，然后在里面新建一个文件

[root@localhost admin]# mkdir DockerComposeFolder
[root@localhost admin]# cd DockerComposeFolder/
[root@localhost DockerComposeFolder]# vim docker-compose.yml

文件内容如下：（自定义网络见上面）

version: '3.1'

services:
 zoo1:
  image: zookeeper
  restart: always
  privileged: true
  hostname: zoo1
  ports:
   - 2181:2181
  volumes: # 挂载数据
   - /usr/local/zookeeper-cluster/node4/data:/data
   - /usr/local/zookeeper-cluster/node4/datalog:/datalog
  environment:
   ZOO_MY_ID: 4
   ZOO_SERVERS: server.4=0.0.0.0:2888:3888;2181 server.5=zoo2:2888:3888;2181 server.6=zoo3:2888:3888;2181
  networks:
   default:
    ipv4_address: 172.18.0.14

 zoo2:
  image: zookeeper
  restart: always
  privileged: true
  hostname: zoo2
  ports:
   - 2182:2181
  volumes: # 挂载数据
   - /usr/local/zookeeper-cluster/node5/data:/data
   - /usr/local/zookeeper-cluster/node5/datalog:/datalog
  environment:
   ZOO_MY_ID: 5
   ZOO_SERVERS: server.4=zoo1:2888:3888;2181 server.5=0.0.0.0:2888:3888;2181 server.6=zoo3:2888:3888;2181
  networks:
   default:
    ipv4_address: 172.18.0.15

 zoo3:
  image: zookeeper
  restart: always
  privileged: true
  hostname: zoo3
  ports:
   - 2183:2181
  volumes: # 挂载数据
   - /usr/local/zookeeper-cluster/node6/data:/data
   - /usr/local/zookeeper-cluster/node6/datalog:/datalog
  environment:
   ZOO_MY_ID: 6
   ZOO_SERVERS: server.4=zoo1:2888:3888;2181 server.5=zoo2:2888:3888;2181 server.6=0.0.0.0:2888:3888;2181
  networks:
   default:
    ipv4_address: 172.18.0.16

networks: # 自定义网络
 default:
  external:
   name: zoonet

注意yaml文件里不能有tab，只能有空格。

关于version与Docker版本的关系如下：

Docker下安装zookeeper(单机和集群)

然后执行（-d后台启动）

docker-compose -f docker-compose.yml up -d

Docker下安装zookeeper(单机和集群)

查看已启动的容器

[root@localhost DockerComposeFolder]# docker ps
CONTAINER ID    IMAGE        COMMAND         CREATED       STATUS       PORTS                         NAMES
a2c14814037d    zookeeper      "/docker-entrypoin..."  6 minutes ago    Up About a minute  2888/tcp, 3888/tcp, 8080/tcp, 0.0.0.0:2183->2181/tcp  dockercomposefolder_zoo3_1
50310229b216    zookeeper      "/docker-entrypoin..."  6 minutes ago    Up About a minute  2888/tcp, 3888/tcp, 0.0.0.0:2181->2181/tcp, 8080/tcp  dockercomposefolder_zoo1_1
475d8a9e2d08    zookeeper      "/docker-entrypoin..."  6 minutes ago    Up About a minute  2888/tcp, 3888/tcp, 8080/tcp, 0.0.0.0:2182->2181/tcp  dockercomposefolder_zoo2_1

进入一个容器

[root@localhost DockerComposeFolder]# docker exec -it a2c14814037d bash
root@zoo3:/apache-zookeeper-3.5.5-bin# ./bin/zkCli.sh
Connecting to localhost:2181

....

WatchedEvent state:SyncConnected type:None path:null
[zk: localhost:2181(CONNECTED) 0] 
[zk: localhost:2181(CONNECTED) 1] ls /
[zookeeper]
[zk: localhost:2181(CONNECTED) 2] create /hi
Created /hi
[zk: localhost:2181(CONNECTED) 3] ls /
[hi, zookeeper]

进入另一个容器

[root@localhost DockerComposeFolder]# docker exec -it 50310229b216 bash
root@zoo1:/apache-zookeeper-3.5.5-bin# ./bin/zkCli.sh
Connecting to localhost:2181

...

WatchedEvent state:SyncConnected type:None path:null

[zk: localhost:2181(CONNECTED) 0] ls /
[hi, zookeeper]

本地客户端连接集群：

zkCli.cmd -server 192.168.192.128:2181,192.168.192.128:2182,192.168.192.128:2183

Docker下安装zookeeper(单机和集群)

查看

Docker下安装zookeeper(单机和集群)

停止所有活动容器

Docker下安装zookeeper(单机和集群)

删除所有已停止的容器

Docker下安装zookeeper(单机和集群)

更多docker-compose的命令：

[root@localhost DockerComposeFolder]# docker-compose --help
Define and run multi-container applications with Docker.

Usage:
 docker-compose [-f <arg>...] [options] [COMMAND] [ARGS...]
 docker-compose -h|--help

Options:
 -f, --file FILE       Specify an alternate compose file
               (default: docker-compose.yml)
 -p, --project-name NAME   Specify an alternate project name
               (default: directory name)
 --verbose          Show more output
 --log-level LEVEL      Set log level (DEBUG, INFO, WARNING, ERROR, CRITICAL)
 --no-ansi          Do not print ANSI control characters
 -v, --version        Print version and exit
 -H, --host HOST       Daemon socket to connect to

 --tls            Use TLS; implied by --tlsverify
 --tlscacert CA_PATH     Trust certs signed only by this CA
 --tlscert CLIENT_CERT_PATH Path to TLS certificate file
 --tlskey TLS_KEY_PATH    Path to TLS key file
 --tlsverify         Use TLS and verify the remote
 --skip-hostname-check    Don't check the daemon's hostname against the
               name specified in the client certificate
 --project-directory PATH  Specify an alternate working directory
               (default: the path of the Compose file)
 --compatibility       If set, Compose will attempt to convert keys
               in v3 files to their non-Swarm equivalent

Commands:
 build       Build or rebuild services
 bundle       Generate a Docker bundle from the Compose file
 config       Validate and view the Compose file
 create       Create services
 down        Stop and remove containers, networks, images, and volumes
 events       Receive real time events from containers
 exec        Execute a command in a running container
 help        Get help on a command
 images       List images
 kill        Kill containers
 logs        View output from containers
 pause       Pause services
 port        Print the public port for a port binding
 ps         List containers
 pull        Pull service images
 push        Push service images
 restart      Restart services
 rm         Remove stopped containers
 run        Run a one-off command
 scale       Set number of containers for a service
 start       Start services
 stop        Stop services
 top        Display the running processes
 unpause      Unpause services
 up         Create and start containers
 version      Show the Docker-Compose version information
标签：
Docker安装zookeeper,Docker,zookeeper安装
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苹果官宣WWDC 2024！预计会有大批AI功能 - 2024/11/23

3月27日消息，苹果宣布2024年全球开发者大会（WWDC）将于6月10日至6月14日举行，巧合的是，这次大会与端午假期重合。

苹果官方表示：

在线参加 Apple 每年规模最大的开发者盛会。亲眼见证 Apple 最新平台、技术和工具的发布。了解如何创建和改进你的 App 和游戏。与 Apple 设计师和工程师互动交流，与全球开发者社区建立联系。以上活动均免费在线举行。

探索各种新的工具、框架和功能，助力你打造出理想的 App 和游戏。通过视频讲座学习新技能，与 Apple 专家进行一对一会面，以推进你的项目，完善你的构思。

Swift Student Challenge 旨在支持和鼓舞下一代开发者、创作者和企业家。太平洋时间 3 月 28 日，我们将公布今年的获奖者名单。获奖者将有资格参加在 Apple Park 举办的特别活动。我们还会选出 50 名杰出获胜者，他们将受邀前往库比提诺，获得为期三天的非凡体验，包括参加 Apple Park 的特别活动。

RTX 5090要首发 性能要翻倍！三星展示GDDR7显存

三星在GTC上展示了专为下一代游戏GPU设计的GDDR7内存。

首次推出的GDDR7内存模块密度为16GB，每个模块容量为2GB。其速度预设为32 Gbps（PAM3），但也可以降至28 Gbps，以提高产量和初始阶段的整体性能和成本效益。

据三星表示，GDDR7内存的能效将提高20%，同时工作电压仅为1.1V，低于标准的1.2V。通过采用更新的封装材料和优化的电路设计，使得在高速运行时的发热量降低，GDDR7的热阻比GDDR6降低了70%。

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