2. Docker-Linux operation and maintenance
1. Port
Use the netstat command on the registry node to query the listening port number of the warehouse. After the query is complete, use the lsof command (if the command does not exist, install it manually) to query the process using this port number. Submit all the above operation commands and output results to the command line interface in text form.
[root@registry ~]# netstat -ntpl Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 724/sshd tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN 802/master tcp6 0 0 :::5000 :::* LISTEN 21423/docker-proxy tcp6 0 0 :::22 :::* LISTEN 724/sshd tcp6 0 0 ::1:25 :::* LISTEN 802/master [root@registry ~]# lsof -i:5000 COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME exe 21423 root 7u IPv6 267372 0t0 TCP *:commplex-main (LISTEN) |
2. Process
Run the lsof command on the Registry node (manually install it if the command does not exist) to query /usr/bin/docker-current related processes, and query the program executed by the process according to the queried process ID. Submit all the above operation commands and output results to the command line interface in text form.
[root@registry ~]# lsof /usr/bin/docker-current COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME docker-cu 1492 root txt REG 253,1 45797613 16903916 /usr/bin/docker-current exe 21423 root txt REG 253,1 45797613 16903916 /usr/bin/docker-current [root@registry ~]# ps aux |grep 1492 root 1492 0.0 1.9 790336 40752 ? Ssl Feb13 31:08 /usr/bin/docker-current daemon --exec-opt native.cgroupdriver=systemd --selinux-enabled --log-driver=journald --add-registry 192.168.200.12:5000 --insecure-registry 192.168.200.12:5000 root 32269 0.0 0.0 112640 956 pts/0 S+ 02:34 0:00 grep --color=auto 1492 [root@registry ~]# ps aux |grep 21423 root 21423 0.0 0.8 253880 16520 ? Sl Mar03 2:55 docker-proxy -proto tcp -host-ip 0.0.0.0 -host-port 5000 -container-ip 172.17.0.2 -container-port 5000 root 32271 0.0 0.0 112640 960 pts/0 S+ 02:34 0:00 grep --color=auto 21423 |
3. Resource usage
On the registry node, use the netstat command (if the command does not exist, install it manually) to query the PID of the docker image warehouse, and use the top command to query the resource usage of the PID queried in the previous step. Submit all the above operation commands and output results to the command line interface in text form.
[root@registry ~]# netstat -ntpl Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 724/sshd tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN 802/master tcp6 0 0 :::5000 :::* LISTEN 21423/docker-proxy tcp6 0 0 :::22 :::* LISTEN 724/sshd tcp6 0 0 ::1:25 :::* LISTEN 802/master [root@registry ~]# top -p 21423 top - 07:26:24 up 35 days, 3:06, 1 user, load average: 0.00, 0.01, 0.05 Tasks: 1 total, 0 running, 1 sleeping, 0 stopped, 0 zombie %Cpu(s): 0.0 us, 0.0 sy, 0.0 ni,100.0 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st KiB Mem : 2049396 total, 118648 free, 127892 used, 1802856 buff/cache KiB Swap: 0 total, 0 free, 0 used. 1721968 avail Mem PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 21423 root 20 0 253880 16520 7592 S 0.0 0.8 2:57.51 exe |
4.日志
在registry节点通过docker命令查询dockerregistry容器最后20条日志，将以上所有操作命令和输出结果以文本形式提交到命令行界面。
# docker logs --tail=20 940568599bb2 192.168.200.12 - - [29/Mar/2017:05:35:37 +0000] "GET /v2/ HTTP/1.1" 200 2 "" "docker/1.10.3 go/go1.6.3 git-commit/cb079f6-unsupported kernel/3.10.0-229.el7.x86_64 os/linux arch/amd64" 192.168.200.12 - - [29/Mar/2017:05:35:37 +0000] "GET /v1/search?q=swarm HTTP/1.1" 404 19 "" "docker/1.10.3 go/go1.6.3 git-commit/cb079f6-unsupported kernel/3.10.0-229.el7.x86_64 os/linux arch/amd64" time="2017-03-29T05:35:49Z" level=info msg="response completed" go.version=go1.6.3 http.request.host="192.168.200.12:5000" http.request.id=7bc96c9d-e3a4-43fe-9f6f-1be0ad4e8fe3 http.request.method=GET http.request.remoteaddr="192.168.200.12:50872" http.request.uri="/v2/" http.request.useragent="docker/1.10.3 go/go1.6.3 git-commit/cb079f6-unsupported kernel/3.10.0-229.el7.x86_64 os/linux arch/amd64" http.response.contenttype="application/json; charset=utf-8" http.response.duration=1.946567ms http.response.status=200 http.response.written=2 instance.id=a5140eb2-63c4-40b1-8c88-24aff334bb6a version=v2.5.1 192.168.200.12 - - [29/Mar/2017:05:35:49 +0000] "GET /v2/ HTTP/1.1" 200 2 "" "docker/1.10.3 go/go1.6.3 git-commit/cb079f6-unsupported kernel/3.10.0-229.el7.x86_64 os/linux arch/amd64" time="2017-03-29T05:35:49Z" level=error msg="response completed with error" err.code="manifest unknown" err.detail="unknown tag=latest" err.message="manifest unknown" go.version=go1.6.3 http.request.host="192.168.200.12:5000" http.request.id=466b5691-ea02-4b27-af3b-340fc69767a4 http.request.method=GET http.request.remoteaddr="192.168.200.12:50873" http.request.uri="/v2/swarm/manifests/latest" http.request.useragent="docker/1.10.3 go/go1.6.3 git-commit/cb079f6-unsupported kernel/3.10.0-229.el7.x86_64 os/linux arch/amd64" http.response.contenttype="application/json; charset=utf-8" http.response.duration=2.057137ms http.response.status=404 http.response.written=96 instance.id=a5140eb2-63c4-40b1-8c88-24aff334bb6a vars.name=swarm vars.reference=latest version=v2.5.1 192.168.200.12 - - [29/Mar/2017:05:35:49 +0000] "GET /v2/swarm/manifests/latest HTTP/1.1" 404 96 "" "docker/1.10.3 go/go1.6.3 git-commit/cb079f6-unsupported kernel/3.10.0-229.el7.x86_64 os/linux arch/amd64" 192.168.200.12 - - [29/Mar/2017:05:35:49 +0000] "GET /v1/repositories/swarm/images HTTP/1.1" 404 19 "" "docker/1.10.3 go/go1.6.3 git-commit/cb079f6-unsupported kernel/3.10.0-229.el7.x86_64 os/linux arch/amd64" time="2017-03-29T06:10:09Z" level=info msg="PurgeUploads starting: olderThan=2017-03-22 06:10:09.06177115 +0000 UTC, actuallyDelete=true" time="2017-03-29T06:10:09Z" level=info msg="Purge uploads finished. Num deleted=0, num errors=0" time="2017-03-29T06:10:09Z" level=info msg="Starting upload purge in 24h0m0s" go.version=go1.6.3 instance.id=a5140eb2-63c4-40b1-8c88-24aff334bb6a version=v2.5.1 |