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注意：
docker使用后台运行，必须有一个前台进程，docker发现没有应用，就会自动停止；
nginx容器启动后，发现自己没有提供服务，就会立即停止，就是没有程序了。
1.查看日志
docker log -f -t --tail 10 容器
docker run -d centos /bin/sh -c "while true;do echo rizhi;sleep 1;done"
查看日志
-tf ： #显示日志 t:时间戳 f:动态显示
–tail number # 要显示的日志条数
[root@VM-0-9-centos ~]
2021-08-24T14:22:30.123258831Z rizhi
2021-08-24T14:22:31.124990296Z rizhi
2021-08-24T14:22:32.126686655Z rizhi
2021-08-24T14:22:33.128395685Z rizhi
2021-08-24T14:22:34.130117944Z rizhi
2021-08-24T14:22:35.131881590Z rizhi
2021-08-24T14:22:36.133743533Z rizhi
2021-08-24T14:22:37.136511874Z rizhi
2021-08-24T14:22:38.137442775Z rizhi
2021-08-24T14:22:39.139236017Z rizhi
2021-08-24T14:22:40.141035656Z rizhi
2021-08-24T14:22:41.142850480Z rizhi
2021-08-24T14:22:42.144932998Z rizhi
2021-08-24T14:22:43.146684473Z rizhi
查看容器中的进程信息 ps
命令 docker top 容器id
[root@VM-0-9-centos ~]
UID PID PPID C STIME TTY TIME CMD
root 1496763 1496745 0 22:20 ? 00:00:00 /bin/sh -c while true;do echo rizhi;sleep 1;done
root 1498196 1496763 0 22:26 ? 00:00:00 /usr/bin/coreutils --coreutils-prog-shebang=sleep /usr/bin/sleep 1
查看镜像的元数据
docker inspect 容器id
[root@VM-0-9-centos ~]
[
{
"Id": "3f818d81c23e68dbf46d9022e9693d72460db40f68a8bd3b07b57fcac1e016a4",
"Created": "2021-08-24T14:20:14.532415456Z",
"Path": "/bin/sh",
"Args": [
"-c",
"while true;do echo rizhi;sleep 1;done"
],
"State": {
"Status": "running",
"Running": true,
"Paused": false,
"Restarting": false,
"OOMKilled": false,
"Dead": false,
"Pid": 1496763,
"ExitCode": 0,
"Error": "",
"StartedAt": "2021-08-24T14:20:14.856594947Z",
"FinishedAt": "0001-01-01T00:00:00Z"
},
"Image": "sha256:300e315adb2f96afe5f0b2780b87f28ae95231fe3bdd1e16b9ba606307728f55",
"ResolvConfPath": "/var/lib/docker/containers/3f818d81c23e68dbf46d9022e9693d72460db40f68a8bd3b07b57fcac1e016a4/resolv.conf",
"HostnamePath": "/var/lib/docker/containers/3f818d81c23e68dbf46d9022e9693d72460db40f68a8bd3b07b57fcac1e016a4/hostname",
"HostsPath": "/var/lib/docker/containers/3f818d81c23e68dbf46d9022e9693d72460db40f68a8bd3b07b57fcac1e016a4/hosts",
"LogPath": "/var/lib/docker/containers/3f818d81c23e68dbf46d9022e9693d72460db40f68a8bd3b07b57fcac1e016a4/3f818d81c23e68dbf46d9022e9693d72460db40f68a8bd3b07b57fcac1e016a4-json.log",
"Name": "/unruffled_elgamal",
"RestartCount": 0,
"Driver": "overlay2",
"Platform": "linux",
"MountLabel": "",
"ProcessLabel": "",
"AppArmorProfile": "",
"ExecIDs": null,
"HostConfig": {
"Binds": null,
"ContainerIDFile": "",
"LogConfig": {
"Type": "json-file",
"Config": {}
},
"NetworkMode": "default",
"PortBindings": {},
"RestartPolicy": {
"Name": "no",
"MaximumRetryCount": 0
},
"AutoRemove": false,
"VolumeDriver": "",
"VolumesFrom": null,
"CapAdd": null,
"CapDrop": null,
"CgroupnsMode": "host",
"Dns": [],
"DnsOptions": [],
"DnsSearch": [],
"ExtraHosts": null,
"GroupAdd": null,
"IpcMode": "private",
"Cgroup": "",
"Links": null,
"OomScoreAdj": 0,
"PidMode": "",
"Privileged": false,
"PublishAllPorts": false,
"ReadonlyRootfs": false,
"SecurityOpt": null,
"UTSMode": "",
"UsernsMode": "",
"ShmSize": 67108864,
"Runtime": "runc",
"ConsoleSize": [
0,
0
],
"Isolation": "",
"CpuShares": 0,
"Memory": 0,
"NanoCpus": 0,
"CgroupParent": "",
"BlkioWeight": 0,
"BlkioWeightDevice": [],
"BlkioDeviceReadBps": null,
"BlkioDeviceWriteBps": null,
"BlkioDeviceReadIOps": null,
"BlkioDeviceWriteIOps": null,
"CpuPeriod": 0,
"CpuQuota": 0,
"CpuRealtimePeriod": 0,
"CpuRealtimeRuntime": 0,
"CpusetCpus": "",
"CpusetMems": "",
"Devices": [],
"DeviceCgroupRules": null,
"DeviceRequests": null,
"KernelMemory": 0,
"KernelMemoryTCP": 0,
"MemoryReservation": 0,
"MemorySwap": 0,
"MemorySwappiness": null,
"OomKillDisable": false,
"PidsLimit": null,
"Ulimits": null,
"CpuCount": 0,
"CpuPercent": 0,
"IOMaximumIOps": 0,
"IOMaximumBandwidth": 0,
"MaskedPaths": [
"/proc/asound",
"/proc/acpi",
"/proc/kcore",
"/proc/keys",
"/proc/latency_stats",
"/proc/timer_list",
"/proc/timer_stats",
"/proc/sched_debug",
"/proc/scsi",
"/sys/firmware"
],
"ReadonlyPaths": [
"/proc/bus",
"/proc/fs",
"/proc/irq",
"/proc/sys",
"/proc/sysrq-trigger"
]
},
"GraphDriver": {
"Data": {
"LowerDir": "/var/lib/docker/overlay2/389f807d7230a4c81797f454300f912737f696aa4b5cf29753a75a510ead643f-init/diff:/var/lib/docker/overlay2/f1fa23a7c80519d2310bc03823a8b7f49b1995417c262e426aee026cb9e052b3/diff",
"MergedDir": "/var/lib/docker/overlay2/389f807d7230a4c81797f454300f912737f696aa4b5cf29753a75a510ead643f/merged",
"UpperDir": "/var/lib/docker/overlay2/389f807d7230a4c81797f454300f912737f696aa4b5cf29753a75a510ead643f/diff",
"WorkDir": "/var/lib/docker/overlay2/389f807d7230a4c81797f454300f912737f696aa4b5cf29753a75a510ead643f/work"
},
"Name": "overlay2"
},
"Mounts": [],
"Config": {
"Hostname": "3f818d81c23e",
"Domainname": "",
"User": "",
"AttachStdin": false,
"AttachStdout": false,
"AttachStderr": false,
"Tty": false,
"OpenStdin": false,
"StdinOnce": false,
"Env": [
"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
],
"Cmd": [
"/bin/sh",
"-c",
"while true;do echo rizhi;sleep 1;done"
],
"Image": "centos",
"Volumes": null,
"WorkingDir": "",
"Entrypoint": null,
"OnBuild": null,
"Labels": {
"org.label-schema.build-date": "20201204",
"org.label-schema.license": "GPLv2",
"org.label-schema.name": "CentOS Base Image",
"org.label-schema.schema-version": "1.0",
"org.label-schema.vendor": "CentOS"
}
},
"NetworkSettings": {
"Bridge": "",
"SandboxID": "2bbff1d7c403e316862afc4682c0ddbaae5eb510b8297515fd9b9d4fbcbc945d",
"HairpinMode": false,
"LinkLocalIPv6Address": "",
"LinkLocalIPv6PrefixLen": 0,
"Ports": {},
"SandboxKey": "/var/run/docker/netns/2bbff1d7c403",
"SecondaryIPAddresses": null,
"SecondaryIPv6Addresses": null,
"EndpointID": "d0a4a5a7dcfa20c18b2892bbe2e6df23e1f7857e5d0b0a0c677b43b90fd784c4",
"Gateway": "172.18.0.1",
"GlobalIPv6Address": "",
"GlobalIPv6PrefixLen": 0,
"IPAddress": "172.18.0.4",
"IPPrefixLen": 16,
"IPv6Gateway": "",
"MacAddress": "02:42:ac:12:00:04",
"Networks": {
"bridge": {
"IPAMConfig": null,
"Links": null,
"Aliases": null,
"NetworkID": "61e72818ec60a0e3a31c5ba57e82e033446e52aac5837926e0e2c8216572826b",
"EndpointID": "d0a4a5a7dcfa20c18b2892bbe2e6df23e1f7857e5d0b0a0c677b43b90fd784c4",
"Gateway": "172.18.0.1",
"IPAddress": "172.18.0.4",
"IPPrefixLen": 16,
"IPv6Gateway": "",
"GlobalIPv6Address": "",
"GlobalIPv6PrefixLen": 0,
"MacAddress": "02:42:ac:12:00:04",
"DriverOpts": null
}
}
}
}
]
进入当前正在运行的容器
我们通常容器都是使用后台方式运行，需要进入容器修改配置
命令
docker exec -it 容器di bashShell
[root@VM-0-9-centos ~]
root@045a9b51b395:/usr/local/tomcat
UID PID PPID C STIME TTY TIME CMD
root 1 0 0 02:27 pts/0 00:00:39 /usr/local/openjdk-11/bin/java -Djava.util.logging.config.file=/usr/loc
root 27 0 0 14:39 pts/1 00:00:00 /bin/bash
root 34 27 0 14:39 pts/1 00:00:00 ps -ef
docker attach e160eb260ebd
docker exec ：进入容器后开启一个新的终端，可以在里面操作（常用）
docker attach：进入容器正在执行的终端，不会启动新的进程
从容器内拷贝文件到主机
[root@3f818d81c23e /]
[root@3f818d81c23e home]
[root@3f818d81c23e home]
test.java
[root@3f818d81c23e home]
exit
[root@VM-0-9-centos ~]
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
3f818d81c23e centos "/bin/sh -c 'while t…" 32 minutes ago Up 32 minutes unruffled_elgamal
045a9b51b395 tomcat "catalina.sh run" 12 hours ago Up 12 hours 8080/tcp tomcat
[root@VM-0-9-centos ~]
拷贝是一个手动过程，未来使用-V卷的技术
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