10 unpopular but very practical docker tips

Programmer Bai Nannan 2021-01-20 21:59:57
unpopular practical docker tips


In normal work ,docker A lot of contact , In addition to the regular use of docker run ,docker stop Wait for the order ,docker There are also a lot of very useful but infrequently used commands , Here's a summary :

1. docker top

This command is used to view the process information in a container , For example, you want to see a nginx There are several in the container nginx Process time , You can do this :

docker top 3b307a09d20d
UID PID PPID C STIME TTY TIME CMD
root 805 787 0 Jul13 ? 00:00:00 nginx: master process nginx -g daemon off;
systemd+ 941 805 0 Jul13 ? 00:03:18 nginx: worker process

2. docker load && docker save

I usually use these two commands to download and package Kubernetes Mirror image , Because you know, the Internet speed in China is not as fast as that in foreign countries . Put together a copy of Java Interview book full version PDF

docker save You can save a mirror image to tar In file , You can do this :

~ docker save registry:2.7.1 >registry-2.7.1.tar
# meanwhile docker load You can take the mirror image from tar File import to docker in
~ docker load < registry-2.7.1.tar

3. docker search

This command can help you search conveniently on the command line DockerHub In the mirror , such as :

~ docker search nginx
NAME DESCRIPTION STARS OFFICIAL AUTOMATED
nginx Official build of Nginx. 13519 [OK]
jwilder/nginx-proxy Automated Nginx reverse proxy for docker con… 1846 [OK]
richarvey/nginx-php-fpm Container running Nginx + PHP-FPM capable of… 780 [OK]
linuxserver/nginx An Nginx container, brought to you by LinuxS… 123
bitnami/nginx Bitnami nginx Docker Image 87 [OK]
tiangolo/nginx-rtmp Docker image with Nginx using the nginx-rtmp… 85 [OK]
jc21/nginx-proxy-manager Docker container for managing Nginx proxy ho… 73
alfg/nginx-rtmp NGINX, nginx-rtmp-module and FFmpeg from sou… 71 [OK]
nginxdemos/hello NGINX webserver that serves a simple page co… 57 [OK]
jlesage/nginx-proxy-manager Docker container for Nginx Proxy Manager 53 [OK]
nginx/nginx-ingress NGINX Ingress Controller for Kubernetes 37
......

Of course, this function may not be particularly easy to use in China , because ......

4. docker events

This command can help you access docker All kinds of event information , Like creating a container or something .

~ docker events
2020-07-28T21:28:46.000403018+08:00 image load sha256:432bf69f0427b52cad10897342eaf23521b7d973566354118e9a59c4d31b5fae (name=sha256:432bf69f0427b52cad10897342eaf23521b7d973566354118e9a59c4d31b5fae)

5. docker update

When you docker run After that, I found that there are some parameters that are not the state you want, such as the state you set nginx Containers cpu Or the memory is too small , You can use docker update To modify these parameters .

~ docker update nginx --cpus 2

6. docker history

When you modify a mirror image , But forget the modification command for each layer , Or you can use this command when you want to see how an image is built , such as :

~ docker history traefik:v2.1.6
IMAGE CREATED CREATED BY SIZE COMMENT
5212a87ddaba 5 months ago /bin/sh -c #(nop) LABEL org.opencontainers.… 0B
<missing> 5 months ago /bin/sh -c #(nop) CMD ["traefik"] 0B
<missing> 5 months ago /bin/sh -c #(nop) ENTRYPOINT ["/entrypoint.… 0B
<missing> 5 months ago /bin/sh -c #(nop) EXPOSE 80 0B
<missing> 5 months ago /bin/sh -c #(nop) COPY file:59a219a1fb7a9dc8… 419B
<missing> 5 months ago /bin/sh -c set -ex; apkArch="$(apk --print-… 52.9MB
<missing> 5 months ago /bin/sh -c apk --no-cache add ca-certificate… 1.85MB
<missing> 6 months ago /bin/sh -c #(nop) CMD ["/bin/sh"] 0B
<missing> 6 months ago /bin/sh -c #(nop) ADD file:a1906f14a4e217a49… 4.81MB

7. docker wait

This command can check the exit status of the container , such as :

~ docker wait 7f7f0522a7d0
0

In this way, you can know whether the container exited normally or abnormally .

8. docker pause && docker unpause

When you run a container but want to pause it , You can use this command .

~ docker pause 7f7f0522a7d0

9. docker diff

When you run a container , But you don't know which files have been modified in the container , such as :

~ docker diff 38c59255bf6e
C /etc
A /etc/localtime
C /var
C /var/lib
A /var/lib/registry

10. docker stats

This is docker Built in monitoring command , When you want to see all containers under the current host occupy memory and cpu You can use this command when you need to . Put together a copy of Java Interview book full version PDF

~ docker stats
CONTAINER ID NAME CPU % MEM USAGE / LIMIT MEM % NET I/O BLOCK I/O PIDS
1c5ade04e7f9 redis 0.08% 17.53MiB / 47.01GiB 0.04% 10.9GB / 37GB 0B / 0B 4
afe6d4ebe409 kafka-exporter 0.09% 16.91MiB / 47.01GiB 0.04% 1.97GB / 1.53GB 752MB / 0B 23
f0c7c01a9c34 kafka-docker_zookeeper 0.01% 308.8MiB / 47.01GiB 0.64% 20.2MB / 12.2MB 971MB / 3.29MB 28
da8c5008955f kafka-docker_kafka-manager 0.08% 393.2MiB / 47.01GiB 0.82% 1.56MB / 2.61MB 1.14GB / 0B 60
c8d51c583c49 kafka-docker_kafka 1.63% 1.256GiB / 47.01GiB 2.67% 30.4GB / 48.9GB 22.3GB / 5.77GB 85
......

 
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本文为[Programmer Bai Nannan]所创,转载请带上原文链接,感谢
https://javamana.com/2021/01/20210120215828002x.html

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