本人在初學docker的時候,感覺對於docker的配置文件有點搞不定,一會是/etc/sysconfig/docker,一會是/etc/docker/daemon.json,一會是/etc/systemd/system/docker.service.d目錄下,更有甚者是/usr/lib/systemd/system/docker.service。
比如配置一個INSECURE-REGISTRY,就可以在/etc/sysconfig/docker文件里添加,也可以在/etc/docker/daemon.json文件里添加。特別的,這兩個文件里的格式還不一樣!!
這些配置文件到底是什么關系呢?是怎么被docker加載生效的呢?下文簡單講述他們之間的關系及docker的一些配置文件規划。
- 拿到一台主機,用systemctl status docker查看docker的運行狀態:
可以看到,加載的其實是/usr/lib/systemd/system/docker.service這個文件。
- 個人認為docker也發現自己的配置文件太分散了,所以搞了一個/etc/docker/daemon.json,但是這個文件默認是不存在的,需要我們手動的去創建(不知道為什么不默認幫我們創建好,就算幫用戶創建一個空的文件也行啊!)。
有了這個文件,我們一些常規的配置,都可以統一在這個文件里進行設置了,如下是/etc/docker/daemon.json的所有配置項:
{ "authorization-plugins": [], "data-root": "", "dns": [], "dns-opts": [], "dns-search": [], "exec-opts": [], "exec-root": "", "experimental": false, "storage-driver": "", "storage-opts": [], "labels": [], "live-restore": true, "log-driver": "", "log-opts": {}, "mtu": 0, "pidfile": "", "cluster-store": "", "cluster-store-opts": {}, "cluster-advertise": "", "max-concurrent-downloads": 3, "max-concurrent-uploads": 5, "default-shm-size": "64M", "shutdown-timeout": 15, "debug": true, "hosts": [], "log-level": "", "tls": true, "tlsverify": true, "tlscacert": "", "tlscert": "", "tlskey": "", "swarm-default-advertise-addr": "", "api-cors-header": "", "selinux-enabled": false, "userns-remap": "", "group": "", "cgroup-parent": "", "default-ulimits": {}, "init": false, "init-path": "/usr/libexec/docker-init", "ipv6": false, "iptables": false, "ip-forward": false, "ip-masq": false, "userland-proxy": false, "userland-proxy-path": "/usr/libexec/docker-proxy", "ip": "0.0.0.0", "bridge": "", "bip": "", "fixed-cidr": "", "fixed-cidr-v6": "", "default-gateway": "", "default-gateway-v6": "", "icc": false, "raw-logs": false, "allow-nondistributable-artifacts": [], "registry-mirrors": [], "seccomp-profile": "", "insecure-registries": [], "no-new-privileges": false, "default-runtime": "runc", "oom-score-adjust": -500, "node-generic-resources": ["NVIDIA-GPU=UUID1", "NVIDIA-GPU=UUID2"], "runtimes": { "cc-runtime": { "path": "/usr/bin/cc-runtime" }, "custom": { "path": "/usr/local/bin/my-runc-replacement", "runtimeArgs": [ "--debug" ] } } }
- 所有的涉及到配置文件修改后,需要重啟docker服務,讓其加載生效。
# systemctl daemon-reload
# systemctl restart docker
- daemon.json里的內容記不住怎么辦?
# man dockerd