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MoinMoin in Production on CoreOS - Part5: Data Volume Container

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Previously I deployed plain MoinMoin CoreOS instance on IDCF Cloud. Next thing should I do is to serve with data volume contaner. Without fleet it is easy to backup and restore using docker-backup. Considering how difficult it is to write fleet unit files for me, it would take time to practice. I think I'm ready to face the day.

Previously I deployed plain MoinMoin CoreOS instance on IDCF Cloud. Next thing should I do is to serve with data volume contaner. Without fleet it is easy to backup and restore using docker-backup. Considering how difficult it is to write fleet unit files for me, it would take time to practice. I think I’m ready to face the day.

ExecStartPre directive

First thing that comes to my mind is to use ExecStartPre directive. In the ExecStartPre directive it could be started data volume container.

ExecStartPre=/usr/bin/docker pull busybox
ExecStartPre=/usr/bin/docker run -v /usr/local/share/moin/data/pages --name wiki-vol busybox true
ExecStart=/usr/bin/docker run --name moin --volumes-from wiki-vol -p 80:80 10.1.1.32:5000/moin

I wonder what I should do to restore MoinMoin backuped tar.gz into data volume container?

moin.service

I prepended many ExecStartPre directives preparing data volume container. Fortunately this attempt was successful.

~/docker_apps/moin/moin.service
[Unit]
Description=MoinMoin Service
Requires=docker.service
After=docker.service
[Service]
TimeoutStartSec=0
ExecStartPre=-/usr/bin/docker kill moin wiki-vol
ExecStartPre=-/usr/bin/docker rm moin wiki-vol
ExecStartPre=/usr/bin/wget -N -P /tmp https://www.dropbox.com/s/xxx/141020000501_pages.tar.gz
ExecStartPre=/usr/bin/docker run -v /usr/local/share/moin/data/pages --name wiki-vol busybox true
ExecStartPre=/usr/bin/docker run --rm --volumes-from wiki-vol -v /tmp:/backup ubuntu:14.04 tar zxfv /backup/141020000501_pages.tar.gz --strip-components=1 -C /usr/local/share/moin/data/pages
ExecStart=/usr/bin/docker run --name moin --volumes-from wiki-vol -p 80:80 10.1.1.32:5000/moin
ExecStop=/usr/bin/docker stop moin
[Install]
WantedBy=multi-user.target

Update unit

To update moin unit I run fleetctl cycle as usual.

$ export FLEETCTL_TUNNEL=10.1.1.191
$ fleetctl destroy moin.service
$ fleetctl submit moin.service
$ fleetctl start moin.service

Waiting to start moin unit with journal -f. 

$ fleetctl journal -f moin.service

Finally I opened a MoinMoin URL.