Troubleshooting Docker Issues

Corrupted DB	Issue: The following message appear when starting docker: updating the store state of sandbox failed: failed to update store for object type *libnetwork.sbState: json: cannot unmarshal string into Go struct field sbState.ExtDNS of type libnetwork.extDNSEntry Solution:   systemctl stop docker mv /var/lib/docker/network/files/local-kv.db /root/corrupted-local-kv.db systemctl start docker Source: https://access.redhat.com/solutions/3351601
Can't start docker	Resolution: Try "journalctl -u docker.service" and see what's happening Mar 16 13:46:53 gdc-co-ragent01 dockerd[1403]: can't create unix socket /var/run/docker.sock: is a directory Mar 16 13:46:53 gdc-co-ragent01 systemd[1]: docker.service: main process exited, code=exited, status=1/FAILURE Mar 16 13:46:53 gdc-co-ragent01 systemd[1]: Failed to start Docker Application Container Engine.  Resolution: rm -fr /var/run/docker.sock systemctl start docker
Phantom containers causes docker unable to run containers with same name	8a81cf7cb9f3fd03e0139743d3616eb0e/kill returned error: Cannot kill container 78d3e2cc93abc053238e0edd5765f428a81cf7cb9f3fd03e0139743d3616eb0e: Container 78d3e2cc93abc053238e0edd5765f428a81cf7cb9f3fd03e0139743d3616eb0e is not running" Resolution: 1. check those phantom containers: doker ps -a 2. remove them: docker rm -f
containers cannot ping outside IPs	Things you might want to check: 1. Make sure /proc/sys/net/ipv4/ip_forward is set to 1
No more space left on thin pool	Resolution: Extend the thinpool:   lvextend -L +10G /dev/mapper/base-thinpool
Error on docker-compose	Running docker-compose as a container with the following error: Couldn't find `docker` binary. You might need to install Docker Resolution: Create .env on the directory where you are running docker-compose and put the following: COMPOSE_INTERACTIVE_NO_CLI=1
Cannot login to docker registry due to missing port	Issue: The following message appear when you login to docker registry. Error response from daemon: Get https://gitlab.xyz.com:4567/v2/: Get https://gitlab.xyz.com/jwt/auth?account=root&client_id=docker&offline_token=true&service=container_registry: net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers) (Client.Timeout exceeded while awaiting headers) Resolution: Make sure docker port and 443/tcp is allowed from source to destination https://medium.com/@dan.lindow/docker-login-error-awaiting-headers-3fe01e2a1e2f
Resource Temporary unavailable due to TaskMax setting	- try adding "TasksMax=infinity" in docker.service - restart docker - monitor for occurence of issue https://success.docker.com/article/how-to-reserve-resource-temporarily-unavailable-errors-due-to-tasksmax-setting https://github.com/chef-cookbooks/docker/issues/871