60 lines
2.7 KiB
Markdown
60 lines
2.7 KiB
Markdown
---
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title: "Web-Server Transition"
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date: 2019-04-08T23:59:00+02:00
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draft: false
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categories: [www]
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tags: [centos, apache, mariadb]
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url: /posts/webserver-transition/
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author: "Christoph Cullmann"
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---
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Several years the [kate-editor.org](https://kate-editor.org) & [cullmann.io](https://cullmann.io) pages got hosted on a [Hetzner](https://www.hetzner.de/) root server.
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To reduce costs and switch away from old hardware they got now moved to an [OpenVZ](https://openvz.org/) based virtual server at [Host Europe](https://www.hosteurope.de).
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On both servers [CentOS](https://centos.org) 7.x is running, it did always provide a stable foundation for the services these sites use.
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As with any server move in the past, I always need to search how to best move the data/config from one server to the other.
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To document this for me and others, here the quick way to move the basic things needed for web services using just plain [Apache](https://httpd.apache.org/) & [MariaDB](https://mariadb.org/).
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The following steps assume you have installed the same packages on both machines and the new machine is allowed to ssh as root to the old one.
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If you have non-system users, you should create them with the same ids as on the old server.
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For the following shell commands, the old server address is $SERV and the MariaDB root password is $PASS on both machines.
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Best use the raw IP as address if you are in parallel updating your DNS entries to avoid confusion (and wrong syncs).
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**Attention: Wrong syncing of stuff can have disastrous consequences! Check all commands again before executing them, don't trust random people like me without verification!**
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* sync your data, assuming it is in /home and /srv/(ftp/www)
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{{< highlight bash >}}
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rsync --delete -av root@$SERV:/home/ /home
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rsync --delete -av root@$SERV:/srv/ftp /srv
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rsync --delete -av root@$SERV:/srv/www /srv
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{{< / highlight >}}
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* transfer your databases
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{{< highlight bash >}}
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ssh root@$SERV "mysqldump -u root -p$PASS --all-databases > /root/db.sql"
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scp root@$SERV:/root/db.sql /root/
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mysql -u root -p$PASS < /root/db.sql
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{{< / highlight >}}
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* sync configs (you might need more, this is just apache & vsftp)
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{{< highlight bash >}}
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rsync --delete -av root@$SERV:/etc/httpd /etc
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rsync --delete -av root@$SERV:/etc/letsencrypt /etc
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rsync --delete -av root@$SERV:/etc/vsftpd /etc
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{{< / highlight >}}
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* get crontabs over for later re-use, store them in the root home
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{{< highlight bash >}}
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rsync --delete -av root@$SERV:/var/spool/cron /root
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{{< / highlight >}}
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Now all things should be there and after some service restarts e.g. [WordPress](https://wordpress.org/) powered pages should be up-and-running again.
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I hope this short how-to helps others and allows me to avoid searching stuff in the future once again from scratch.
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