• Docker之swarm集群

    Docker之swarm集群


    官方网站:


    环境:
    CentOS 7.0
    docker-engine-1.11.2

    swarm-m.example.com(192.168.8.101)
    swarm-a1.example.com(192.168.8.102)
    swarm-a2.example.com(192.168.8.103)

    说明:swarm支持多种discovery方式
    Docker Hub内置的服务发现功能，这也是官网示例演示的方式
    本地的静态文件描述集群(static file describing the cluster)
    etcd，请参看Docker GUI之Shipyard
    zookeeper和一些静态的ip列表(a static list of ips)

    [root@swarm-m ~]# docker run --rm swarm list --help

    Usage: swarm list [OPTIONS]


    List nodes in a cluster


    Arguments: 

           discovery service to use [$SWARM_DISCOVERY]

                       * token://

                       * consul:///

                       * etcd://,/

                       * file://path/to/file

                       * zk://,/

                       * [nodes://],


    Options:

       --timeout "10s" timeout period

       --discovery-opt [--discovery-opt option --discovery-opt option] discovery options


    示例:

    --discovery dockerhost01:2375,dockerhost02:2375,dockerhost03:2375

    --discovery file:///opt/swarm_config

    --discovery zk://zkhost01,zkhost02,zkhost03/swarm

    --discovery etcd://etcdhost01/swarm

    --discovery consul://consulhost01/swarm



    一.安装docker


    二.拉取swarm镜像
    docker pull swarm


    方式一:本地的静态文件描述集群
    配置swarm manager
    swarm-m.example.com(192.168.8.101)
    cat >/opt/swarm_cluster<<HERE
    192.168.8.102:2375
    192.168.8.103:2375
    HERE

    docker run -tid --restart=always
        -p 3375:3375
        -h swarm-m
        --name=swarm-m
        -v /opt/swarm_cluster:/.swarm/swarm_cluster
        swarm manage -H 0.0.0.0:3375
        file:///.swarm/swarm_cluster
    添加swarm agent
    swarm-a1.example.com(192.168.8.102)
    cat >/opt/swarm_cluster<<HERE
    192.168.8.102:2375
    192.168.8.103:2375
    HERE

    docker run -tid --restart=always
        -h swarm-a1
        --name=swarm-a1
        -v /opt/swarm_cluster:/.swarm/swarm_cluster
        swarm join --addr=192.168.8.102:2375
        file:///.swarm/swarm_cluster
    swarm-a2.example.com(192.168.8.103)
    cat >/opt/swarm_cluster<<HERE
    192.168.8.102:2375
    192.168.8.103:2375
    HERE

    docker run -tid --restart=always
        -h swarm-a2
        --name=swarm-a2
        -v /opt/swarm_cluster:/.swarm/swarm_cluster
        swarm join --addr=192.168.8.103:2375
        file:///.swarm/swarm_cluster


    [root@swarm-m ~]# docker run --rm -v /opt/swarm_cluster:/.swarm/swarm_cluster swarm list file:///.swarm/swarm_cluster

    192.168.8.102:2375

    192.168.8.103:2375

    [root@swarm-m ~]# docker logs -f $(docker ps|grep swarm|awk '{print $1}')

    INFO[0000] Listening for HTTP                            addr=0.0.0.0:3375 proto=tcp

    INFO[0120] Registered Engine swarm-a2.example.com at 192.168.8.103:2375 

    INFO[0120] Registered Engine swarm-a1.example.com at 192.168.8.102:2375 

    ERRO[0653] Update engine specs failed: Cannot connect to the Docker daemon. Is the docker daemon running on this host?  id=RXMY:7YIE:NFVP:KG7T:COMZ:ERUA:PQ36:MX65:KVEN:MJWJ:A2S5:WMMW name=swarm-a2.example.com

    ERRO[0685] Flagging engine as unhealthy. Connect failed 3 times  id=5S52:3JBP:R7LI:JUUN:3BN6:UDQY:OFAH:2RUB:6VZ3:QRPU:PIE5:XDFF name=swarm-a1.example.com

    ERRO[0686] Flagging engine as unhealthy. Connect failed 3 times  id=RXMY:7YIE:NFVP:KG7T:COMZ:ERUA:PQ36:MX65:KVEN:MJWJ:A2S5:WMMW name=swarm-a2.example.com

    ERRO[0686] Update engine specs failed: Cannot connect to the Docker daemon. Is the docker daemon running on this host?  id=RXMY:7YIE:NFVP:KG7T:COMZ:ERUA:PQ36:MX65:KVEN:MJWJ:A2S5:WMMW name=swarm-a2.example.com

    ERRO[0739] Update engine specs failed: Cannot connect to the Docker daemon. Is the docker daemon running on this host?  id=RXMY:7YIE:NFVP:KG7T:COMZ:ERUA:PQ36:MX65:KVEN:MJWJ:A2S5:WMMW name=swarm-a2.example.com

    ERRO[0739] Update engine specs failed: Cannot connect to the Docker daemon. Is the docker daemon running on this host?  id=5S52:3JBP:R7LI:JUUN:3BN6:UDQY:OFAH:2RUB:6VZ3:QRPU:PIE5:XDFF name=swarm-a1.example.com

    ERRO[0804] Update engine specs failed: Cannot connect to the Docker daemon. Is the docker daemon running on this host?  id=RXMY:7YIE:NFVP:KG7T:COMZ:ERUA:PQ36:MX65:KVEN:MJWJ:A2S5:WMMW name=swarm-a2.example.com

    INFO[0816] Engine came back to life after 4 retries. Hooray!  id=5S52:3JBP:R7LI:JUUN:3BN6:UDQY:OFAH:2RUB:6VZ3:QRPU:PIE5:XDFF name=swarm-a1.example.com

    INFO[0895] Engine came back to life after 5 retries. Hooray!  id=RXMY:7YIE:NFVP:KG7T:COMZ:ERUA:PQ36:MX65:KVEN:MJWJ:A2S5:WMMW name=swarm-a2.example.com




    方式二:Docker Hub内置的服务发现功能
    前提:swarm节点能与公网Docker Hub通信
    配置swarm manager
    1.创建集群discovery token(--rm)
    [root@swarm-m ~]# docker run --rm swarm create

    71296873eec3b86a4777054d66fdc164

    2.创建并运行swarm manager容器
    docker run -tid --restart=always
        -p 3375:3375
        -h swarm-m
        --name=swarm-m
        swarm manage -H 0.0.0.0:3375
        token://71296873eec3b86a4777054d66fdc164

    [root@swarm-m ~]# docker logs -f swarm-m

    INFO[0000] Listening for HTTP                            addr=0.0.0.0:3375 proto=tcp


    说明:可以启用tls认证，启动时加认证参数即可
    可以创建自签名ca和证书，过程略

    [root@swarm-m ~]# mkdir -p /opt/swarm/certs

    [root@swarm-m ~]# cp swarm-ca.pem swarm-server.pem swarm-server.key /opt/swarm/certs/

    docker run -tid --restart=always
        -p 3375:3375
        -v /opt/swarm/certs:/certs:ro
        -h swarm-m
        --name=swarm-m
        swarm manage -H 0.0.0.0:3375
        --tlsverify
        --tlscacert=/certs/swarm-ca.pem
        --tlscert=/certs/swarm-server.pem
        --tlskey=/certs/swarm-server.key
        token://71296873eec3b86a4777054d66fdc164


    添加swarm agent

    swarm-a1.example.com(192.168.8.102)
    1.创建并运行swarm agent容器
    docker run -tid --restart=always
        -h swarm-a1
        --name=swarm-a1
        swarm join --addr=192.168.8.102:2375 token://71296873eec3b86a4777054d66fdc164
    2.修改docker监听方式(socket-->tcp)
    sed -i '/-H/s#-H fd://#-H tcp://0.0.0.0:2375 -H unix:///var/run/docker.sock#' /lib/systemd/system/docker.service
    systemctl daemon-reload
    systemctl restart docker

    swarm-a2.example.com(192.168.8.103)
    1.创建并运行swarm agent容器
    docker run -tid --restart=always
        -h swarm-a2
        --name=swarm-a2
        swarm join --addr=192.168.8.103:2375 token://71296873eec3b86a4777054d66fdc164
    2.修改docker监听方式(socket-->tcp)
    sed -i '/-H/s#-H fd://#-H tcp://0.0.0.0:2375 -H unix:///var/run/docker.sock#' /lib/systemd/system/docker.service
    systemctl daemon-reload
    systemctl restart docker

    查看集群节点

    docker run --rm swarm list token://71296873eec3b86a4777054d66fdc164
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  • 原文地址：https://www.cnblogs.com/lixuebin/p/10814046.html
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