docker基本配置说明

docker配置文件说明

新版本的docker中，已废弃/etc/sysconfig/docker这种配置方式，转而采用/etc/docker/daemon.json来配置

下面简单列一下daemon.json的配置项与说明：

 {
 "api-cors-header": "", 
 "authorization-plugins": [],
 "bip": "",
 "bridge": "",
 "cgroup-parent": "",
 "cluster-store": "",
 "cluster-store-opts": {},
 "cluster-advertise": "",
 "debug": true, #启用debug的模式，启用后，可以看到很多的启动信息。默认 false
 "default-gateway": "",
 "default-gateway-v6": "",
 "default-runtime": "runc",
 "default-ulimits": {},
 "disable-legacy-registry": false,
 "dns": ["192.168.80.1"], // 设定容器DNS的地址，在容器的 /etc/resolv.conf 文件中可查看。
 "dns-opts": [], // 参考：Docker的启动参数
 "dns-search": [], // 参考：Docker的启动参数
 "exec-opts": [],
 "exec-root": "",
 "fixed-cidr": "",
 "fixed-cidr-v6": "",
 "graph": "/var/lib/docker", ＃已废弃，使用data-root代替
 "data-root": "/var/lib/docker", ＃Docker运行时使用的根路径,根路径下的内容稍后介绍，
                                  默认/var/lib/docker
 "group": "", #Unix套接字的属组,仅指/var/run/docker.sock 
 "hosts": [], #设置容器hosts
 "icc": false,
 "insecure-registries": [],
 "ip": "0.0.0.0",
 "iptables": false,
 "ipv6": false,
 "ip-forward": false, // 参考：Docker的启动参数
 "ip-masq": false,
 "labels": ["nodeName=node-121"], //参考：Docker的启动参数
 "live-restore": true,
 "log-driver": "",
 "log-level": "",
 "log-opts": {},
 "max-concurrent-downloads": 3,
 "max-concurrent-uploads": 5,
 "mtu": 0,
 "oom-score-adjust": -500,
 "pidfile": "", #Docker守护进程的PID文件
 "raw-logs": false,
 "registry-mirrors": ["xxxx"], #镜像加速的地址，增加后在 docker info 中可查看。
 "runtimes": {
 "runc": {
 "path": "runc"
 },
 "custom": {
 "path": "/usr/local/bin/my-runc-replacement",
 "runtimeArgs": [
 "--debug"
 ]
 }
 },
 "selinux-enabled": false, #参考：Docker的启动参数
 "storage-driver": "",
 "storage-opts": [],
 "swarm-default-advertise-addr": "",
 "tls": true, #参考：Docker的启动参数
 "tlscacert": "", #参考：Docker的启动参数
 "tlscert": "", #参考：Docker的启动参数
 "tlskey": "", #参考：Docker的启动参数
 "tlsverify": true, #参考：Docker的启动参数
 "userland-proxy": false,
 "userns-remap": ""
 }

docker systemd启动说明

systemd配置文件示例：

# /lib/systemd/system/docker.service

[Unit]
Description=Docker Application Container Engine
Documentation=https://docs.docker.com
After=network-online.target docker.socket firewalld.service
Wants=network-online.target
Requires=docker.socket

[Service]
Type=notify
# the default is not to use systemd for cgroups because the delegate issues still
# exists and systemd currently does not support the cgroup feature set required
# for containers run by docker
ExecStart=/usr/bin/dockerd -H fd://
ExecReload=/bin/kill -s HUP $MAINPID
LimitNOFILE=1048576
# Having non-zero Limit*s causes performance problems due to accounting overhead
# in the kernel. We recommend using cgroups to do container-local accounting.
LimitNPROC=infinity
LimitCORE=infinity
# Uncomment TasksMax if your systemd version supports it.
# Only systemd 226 and above support this version.
TasksMax=infinity
TimeoutStartSec=0
# set delegate yes so that systemd does not reset the cgroups of docker containers
Delegate=yes
# kill only the docker process, not all processes in the cgroup
KillMode=process
# restart the docker process if it exits prematurely
Restart=on-failure
StartLimitBurst=3
StartLimitInterval=60s
# 解决目录被其它的容器挂载使用，导致已经退出的容器无法被删除的问题
MountFlags=slave

[Install]
WantedBy=multi-user.target