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