问题
I have restarted the rancher host a few times while configuring rancher.
Nothing was lost, even though containers had been started and stopped several times during these reboots.
I had to stop and run the container again to set a specific IP for the UI, so I could use the other IP addresses available in the host as HostPorts for containers.
This is the command I had to execute again:
docker run -d --restart=unless-stopped -p 1.2.3.4:80:80 -p 1.2.3.4:443:443 rancher/rancher
After running this, rancher started up as a clean installation, asking me for password, to setup a cluster, and do everything from scratch, even though I see a lot of containers running.
I tried rerunning the command that rancher showed on the first installation (including the old token and ca-checksum). Still nothing.
Why is this happening? Is there a way to restore the data, or should I do the configuration and container creation again?
What is the proper way of cleaning up, if I need to start from scratch? docker rm all containers and do the setup again?
UPDATE
I just found some information from another member in a related question, because this problem happened following a suggestion from another user.
Apparently there is an upgrade process that needs to be followed, but I am missing what needs to be done exactly. I can see my old, stopped container here: https://snag.gy/h2sSpH.jpg
I believe I need to do something with that container so the new rancher container becomes online with the previous data.
Should I be running this?
docker run -d --volumes-from stoic_newton --restart=unless-stopped -p 80:80 -p 443:443 rancher/rancher:latest
回答1:
Ok, I can confirm that this process works.
I have followed the guide here: https://rancher.com/docs/rancher/v2.x/en/upgrades/upgrades/single-node-upgrade/#completing-the-upgrade
I just add to stop the new rancher container which was lacking the data, copy if from the original docker container to create a backup, and then restart the new container with the volumes from the data container which was created in the process.
I could probably have launched the new rancher container with the volumes from the old rancher container, but I preferred playing it safe and following every step of the guide, and as a plus I ended up with a backup :)
来源：https://stackoverflow.com/questions/55371611/rancher-configuration-lost