测试 Docker 的实时恢复功能
1.编辑 Docker 守护进程配置文件/etc/docker/daemon. json，启用实时恢复功能。在该文件中添加以下内容
[root@host1 ~]# vi /etc/docker/daemon.json
[root@host1 ~]# cat /etc/docker/daemon.json
{"registry-mirrors": ["https://9fbd5949cbc94e4a9581e33b9077c811.mirror.swr.myhuaweicloud.com","https://jnh8ca4k.mirror.aliyuncs.com"],"insecure-registries": ["192.168.197.9:5000"]"live-restore": true
}2.重启 Docker 守护进程
[root@host1 ~]# vi /etc/docker/daemon.json
[root@host1 ~]# cat /etc/docker/daemon.json
{"registry-mirrors": ["https://9fbd5949cbc94e4a9581e33b9077c811.mirror.swr.myhuaweicloud.com","https://jnh8ca4k.mirror.aliyuncs.com"],"insecure-registries": ["192.168.197.9:5000"]"live-restore": true
}
[root@host1 ~]# systemctl restart docker
Job for docker.service failed because the control process exited with error code.
See "systemctl status docker.service" and "journalctl -xeu docker.service" for details.
[root@host1 ~]# vi /etc/docker/daemon.json
[root@host1 ~]# cat /etc/docker/daemon.json
{"registry-mirrors": ["https://9fbd5949cbc94e4a9581e33b9077c811.mirror.swr.myhuaweicloud.com","https://jnh8ca4k.mirror.aliyuncs.com"],"insecure-registries": ["192.168.197.9:5000"],"live-restore": true
}
[root@host1 ~]# systemctl restart docker
[root@host1 ~]# docker info
Client: Docker Engine - CommunityVersion: 28.4.0Context: defaultDebug Mode: falsePlugins:buildx: Docker Buildx (Docker Inc.)Version: v0.27.0Path: /usr/libexec/docker/cli-plugins/docker-buildxcompose: Docker Compose (Docker Inc.)Version: v2.39.2Path: /usr/libexec/docker/cli-plugins/docker-composeServer:Containers: 13Running: 1Paused: 0Stopped: 12Images: 20Server Version: 28.4.0Storage Driver: overlay2Backing Filesystem: xfsSupports d_type: trueUsing metacopy: falseNative Overlay Diff: trueuserxattr: falseLogging Driver: json-fileCgroup Driver: systemdCgroup Version: 2Plugins:Volume: localNetwork: bridge host ipvlan macvlan null overlayLog: awslogs fluentd gcplogs gelf journald json-file local splunk syslogCDI spec directories:/etc/cdi/var/run/cdiSwarm: inactiveRuntimes: io.containerd.runc.v2 runcDefault Runtime: runcInit Binary: docker-initcontainerd version: 05044ec0a9a75232cad458027ca83437aae3f4darunc version: v1.2.5-0-g59923efinit version: de40ad0Security Options:seccompProfile: builtincgroupnsKernel Version: 5.14.0-611.el9.x86_64Operating System: CentOS Stream 9OSType: linuxArchitecture: x86_64CPUs: 8Total Memory: 7.47GiBName: host1ID: af1a50fb-c1e8-4693-96ea-aea71e06623bDocker Root Dir: /var/lib/dockerDebug Mode: falseExperimental: falseInsecure Registries:192.168.197.9:5000::1/128127.0.0.0/8Registry Mirrors:https://9fbd5949cbc94e4a9581e33b9077c811.mirror.swr.myhuaweicloud.com/https://jnh8ca4k.mirror.aliyuncs.com/Live Restore Enabled: true注意：第一次错误的原因是 json 格式的问题“少个英文逗号”，修改后成功运行！！！
3.基于 httpd 镜像创建一个运行 Apache 服务容器，然后查看正在运行的容器
[root@host1 ~]# docker run --rm -d --name web1 -p 8080:80 httpd
63625b693a81c137db99ab83ca90ef7ebf48bbf5b30a5923e7df99d9fd0d367b
[root@host1 ~]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
63625b693a81 httpd "httpd-foreground" 14 seconds ago Up 13 seconds 0.0.0.0:8080->80/tcp, [::]:8080->80/tcp web1
0dbf7ea2178e registry "/entrypoint.sh /etc…" 6 days ago Up 3 minutes 0.0.0.0:5000->5000/tcp, [::]:5000->5000/tcp myregistry4.重新加载 Docker守护进程，然后查看正在运行的容器
[root@host1 ~]# systemctl reload docker
[root@host1 ~]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
63625b693a81 httpd "httpd-foreground" 50 seconds ago Up 49 seconds 0.0.0.0:8080->80/tcp, [::]:8080->80/tcp web1
0dbf7ea2178e registry "/entrypoint.sh /etc…" 6 days ago Up 4 minutes 0.0.0.0:5000->5000/tcp, [::]:5000->5000/tcp myregistry5.使用 kill 命令结束 dockerd 守护进程，然后查看正在运行的容器
[root@host1 ~]# kill -SIGHUP $(pidof dockerd)
[root@host1 ~]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
63625b693a81 httpd "httpd-foreground" 2 minutes ago Up 2 minutes 0.0.0.0:8080->80/tcp, [::]:8080->80/tcp web1
0dbf7ea2178e registry "/entrypoint.sh /etc…" 6 days ago Up 5 minutes 0.0.0.0:5000->5000/tcp, [::]:5000->5000/tcp myregistry可以发现该容器还在运行
6.访问该容器提供的 Apache 服务，结果表示该服务正常
[root@host1 ~]# curl http://127.0.0.1:8080
<html><body><h1>It works!</h1></body></html>7.实验完毕，停止该容器后其自动被删除，恢复实验环境
[root@host1 ~]# docker stop logspout
Error response from daemon: No such container: logspout
[root@host1 ~]# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
63625b693a81 httpd "httpd-foreground" 6 minutes ago Up 6 minutes 0.0.0.0:8080->80/tcp, [::]:8080->80/tcp web1
6a4be1b13463 alpine:latest "top" 30 minutes ago Exited (143) 30 minutes ago test
e9786682c0ba redis "docker-entrypoint.s…" 49 minutes ago Exited (0) 47 minutes ago redis
96632885a463 lagoudocker/cadvisor:v0.37.0 "/usr/bin/cadvisor -…" 24 hours ago Exited (0) 24 hours ago cadvisor-stdout
62b9981bf08e php-nginx-supervisor:v1 "/usr/bin/supervisor…" 37 hours ago Exited (255) 33 hours ago 0.0.0.0:8080->80/tcp, [::]:8080->80/tcp php-web-app
7ecac05c7dac centos-with-nginx:1.0 "nginx -g 'daemon of…" 6 days ago Exited (255) 5 days ago 0.0.0.0:8080->80/tcp, [::]:8080->80/tcp test-nginx
0dbf7ea2178e registry "/entrypoint.sh /etc…" 6 days ago Up 9 minutes 0.0.0.0:5000->5000/tcp, [::]:5000->5000/tcp myregistry
c8efe28b118e busybox "sh" 6 days ago Exited (137) 6 days ago stoic_raman
65a371a8cacb httpd "httpd-foreground" 6 days ago Exited (0) 6 days ago testweb
7ab5ac9bc007 ubuntu "/bin/bash" 6 days ago Exited (0) 6 days ago inspiring_joliot
b97f426e8369 ubuntu "/bin/echo" 6 days ago Exited (0) 6 days ago friendly_chaplygin
9ac8245b5b08 img-layers-test "python /app/app.py" 8 days ago Exited (0) 8 days ago crazy_kowalevski
49e91767b48d ubuntu "/bin/bash" 8 days ago Exited (0) 8 days ago frosty_lichterman
38b001022f7a hello-world "/hello" 8 days ago Exited (0) 8 days ago intelligent_brahmagupta
[root@host1 ~]# docker stop web1
web1