Docker modifies the configuration information of an unstarted container
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When I first used docker, I didn't use dockerfile or docker-compose to orchestrate the service. I directly used docker run to start the container. As a result, if the configuration file was wrong or stopped accidentally, the service could no longer be started. Don't worry at this time. You can use the following method to modify the configuration file as well as the port information and other configuration information of the startup container, so that the files and data in the container still exist. 1. Modify the configuration information in the container Here we take nginx startup as an example. For example, we use docker run to create an nginx container. As a result, we use docker exec ** bash to modify the internal nginx configuration file, causing the nginx container to no longer start. What should we do in this case? #First enter the following directory cd /var/lib/docker/overlay2 #Find the configuration file find ./ -name nginx.conf ./a45cd97113877fb480f66e0d982a594c7b18f2035c16e1f7eb687eef15552272/diff/etc/nginx/nginx.conf ./feff64c1f27a695e531c4654afa3b06e1ca84cc38d81cec76dc5ef52f6821c44/diff/etc/nginx/nginx.conf ./feff64c1f27a695e531c4654afa3b06e1ca84cc38d81cec76dc5ef52f6821c44/merged/etc/nginx/nginx.conf #Then cd to the directory where nginx.conf is located cd ./feff64c1f27a695e531c4654afa3b06e1ca84cc38d81cec76dc5ef52f6821c44/diff/etc/nginx #For example, my nginx configuration file is in the conf.d folder cd conf.d default.conf #Observe whether the configuration information in it is your own nginx configuration information. If it is, just modify it. If not, look for it in other directories found by find in the same way. vim *.conf #After modifying the configuration file, start it directly. For example, my nginx container name is apg_nginx docker start apg_nginx 2. Modify the configuration information when running docker In this case, for example, my container is stopped, and other services want to use the port number mapped by my container, or my container wants to modify the run configuration information at that time, what should I do? #Enter the following directory cd /var/lib/docker/containers 096ed809576e948ada99be65faa181b7f926dd0e655c4c373169305a1954c115 d570bc34c3bb5955ec4c336ad3eeb6105ed49e33e87b8dfd35da3c907d074fdc 662d928aada58645e84fba34f1a1c54696061b767e3e262ccf6562db0498e733 e7237690488f15e40a6462df9cdcfeda83a6f7a74517662935c0a149dd36e057 92bb44f63186c3d80ab8557f84cb1ce907aedab714bb0109827dbfed5641daa8 f2849f199fd78b1636aaedf0bd890c12e7c6d8c6ad5849fff2670920e5e37c7d d27bdc6286dd3314a1116115cab3a33233b9f4fba45ae4c88a6756d5c04a9aa9 #Check the hash value of your container. The folder that starts with the hash value is the configuration directory of the container. docker ps -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 096ed809576e nginx "nginx -g 'daemon of..." 3 months ago Up 33 minutes 0.0.0.0:8081->80/tcp apg_nginx #Enter the directory starting with 096 cd 096ed809576e* drwx------ 4 root root 4096 Jun 22 21:41 ./ drwx------ 9 root root 4096 Mar 8 18:07 ../ -rw-r----- 1 root root 2559664 Jun 22 21:47 096ed809576e948ada99be65faa181b7f926dd0e655c4c373169305a1954c115-json.log drwx------ 2 root root 4096 Mar 8 18:07 checkpoints/ -rw------ 1 root root 3408 Jun 22 21:41 config.v2.json -rw-r--r-- 1 root root 1519 Jun 22 21:41 hostconfig.json -rw-r--r-- 1 root root 13 Jun 22 21:41 hostname -rw-r--r-- 1 root root 174 Jun 22 21:41 hosts drwx------ 3 root root 4096 Mar 8 18:07 mounts/ -rw-r--r-- 1 root root 259 Jun 22 21:41 resolv.conf -rw-r--r-- 1 root root 71 Jun 22 21:41 resolv.conf.hash #hostconfig.json is the file that stores the configuration information when run is started vim hostconfig.json #The HostPort value is mapped to the port number of the host machine. You can modify it yourself. After the modification is completed, you need to restart the Docker service. If you do not restart, it will not take effect. systemctl docker restart Through the configuration modifications in the above two situations, any problems with the container started by docker run can be modified here and started normally. Generally, it is best to use docker-compose to start the container. Additional knowledge: How to view container startup logs in Docker
Command format: $ docker logs [OPTIONS] CONTAINER Options: --details Display more information -f, --follow Track real-time logs --since string Display logs after a certain timestamp, or relative time, such as 40m (i.e. 40 minutes) --tail string How many lines of log are displayed from the end of the log, the default is all -t, --timestamps Display timestamps --until string Display logs before a certain timestamp, or relative time, such as 40m (i.e. 40 minutes) View the logs for the last 30 minutes:
View the logs after a certain time:
View logs for a certain period of time:
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