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Docker 远程访问
配置服务端
编辑/lib/systemd/system/docker.service文件，找到ExecStart行，操作如下所示：
ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock
# 修改为
ExecStart=/usr/bin/dockerd -H fd:// -H=tcp://0.0.0.0:2375
systemctl daemon-reload && systemctl restart docker
# 测试访问
curl localhost:2375/images/json
ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock
# 修改为
ExecStart=/usr/bin/dockerd -H fd:// -H=tcp://0.0.0.0:2375
systemctl daemon-reload && systemctl restart docker
# 测试访问
curl localhost:2375/images/json
配置客户端
远程访问之前可以做好SSH免密，在此就不再赘述。
使用环境变量：DOCKER_HOST
例如使用docker-compose时要连接远程docker：
$ DOCKER_HOST="ssh://user@remotehost" docker-compose up -d
$ DOCKER_HOST="ssh://user@remotehost" docker-compose up -d
Docker Context
列出当前主机的Docker 上下文：
$ docker context ls
NAME DESCRIPTION DOCKER ENDPOINT KUBERNETES ENDPOINT ORCHESTRATOR
default * Current DOCKER_HOST based configuration unix:///var/run/docker.sock https://127.0.0.1:6443 (default) swarm
$ docker context ls
NAME DESCRIPTION DOCKER ENDPOINT KUBERNETES ENDPOINT ORCHESTRATOR
default * Current DOCKER_HOST based configuration unix:///var/run/docker.sock https://127.0.0.1:6443 (default) swarm
创建一个新的上下文：
$ docker context create remote ‐‐docker "host=ssh://root@woniu"
# 或者使用tcp进行连接
# docker context create remote --docker "host=tcp://IP:PORT"
remote
Successfully created context “remote”
$ docker context create remote ‐‐docker "host=ssh://root@woniu"
# 或者使用tcp进行连接
# docker context create remote --docker "host=tcp://IP:PORT"
remote
Successfully created context “remote”
临时使用：
$ docker ‐‐context remote ps
CONTAINER ID IMAGE COMMAND CREATED STATUS NAMES
$ docker ‐‐context remote ps
CONTAINER ID IMAGE COMMAND CREATED STATUS NAMES
切换当前上下文：
$ docker context use remote
remote
Current context is now "remote"
$ docker context use remote
remote
Current context is now "remote"