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  • penguin 15:01 on 2016-05-30 Permalink | Reply
    Tags: rancher   

    Migrate Rancher database from container to external 

    I wanted to switch from an in-container database setup to an external database setup. And I didn’t know what happens when you just lose all database contents, and I thought with Docker and some tweaking that should also not be necessary. So I just migrated the databases. Here’s what I did for those interested:

    • stop rancher
    • use a container (sameersbn/mysql) to mount the rancher database content and do a mysqldump
    • import the dump into the external database (AWS RDS instance)
    • start rancher up with different parameters (use external database, as described in the official docs)

    And now the actual command lines:

    # create socket directory
    $ mkdir sockets
    # start sameersbn/mysql to have a mysql container for dumping everything
    $ docker run -d --name temp-mysql -v $(pwd)/sockets:/var/run/mysqld -v $(pwd):/var/lib/mysql sameersbn/mysql
    # dump the database
    $ mysqldump -S ./sockets/mysqld.sock --add-drop-database --add-drop-table --add-drop-trigger --routines --triggers cattle > cattle.sql
    # restore the database in AWS / whatever
    $ mysql -u USERNAME -p -h DB_HOST DB_NAME < cattle.sq

    (Don’t forget to stop the sammersbn container once you’re done). I have configured puppet to start rancher. The final configuration in puppet looks like this:

    ::docker::run { 'rancher-master':
      image   => 'rancher/server',
      ports   => "${rancher_port}:8080",
      volumes => [],
      env     =>  [

    Restart, and it seems to be working just fine. To check go to http://RANCHER_URL/admin/ha (yes, we still use HTTP internally, it will change), and you should see this:

    Bildschirmfoto von »2016-05-30 16-41-23«Nice.


  • penguin 10:51 on 2015-12-08 Permalink | Reply
    Tags: , rancher   

    Rancher IAM role 

    Rancher can create instances on EC2. If you want to define a dedicated IAM user for this, refer to the Amazon docs for the a profile template.

    Unfortunately the first thing you get when using those permissions in rancher is “You are not authorized”. Great. I’ll update this when I know the correct permissions.

    (Source: Rancher docs)

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