112 lines
4.3 KiB
HTML
112 lines
4.3 KiB
HTML
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<title>raid nonsense</title>
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<div id="title">
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<h1 class="nomargin"><a class="ablack" href="https://tilde.team/~ben/blog/index.html">blog // ~ben</a></h1>
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<div id="description">a blog about tildes and other things</div>
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<div id="divbody"><div class="content">
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<!-- entry begin -->
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<h3><a class="ablack" href="raid-nonsense.html">
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raid nonsense
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</a></h3>
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<!-- bashblog_timestamp: #201901131328.45# -->
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<div class="subtitle">January 13, 2019 —
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~ben
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</div>
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<!-- text begin -->
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<p>last week i did some <a href="https://tilde.team/news/?page=025_raid_reboot">maintenance</a>
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on the tilde.team box. probably should have written about it sooner but i didn't
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make time for it until now.</p>
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<hr />
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<p>the gist of the problem was that the default images provided by <a href="https://hetzner.com">hetzner</a>
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default to raid1 between the available disks. our box has two 240gb SSDs, which
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resulted in 200gb usable space for /. it also defaulted to giving us a huge swap
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partition which i deem unnecessary for a box with 64gb ram. </p>
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<p>the only feasible solution that i've found involved using the rescue system and
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the <a href="https://wiki.hetzner.de/index.php/Installimage/en">installimage</a> software
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to reconfigure the disk partitions.</p>
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<p><a href="https://yourtilde.com/~deepend/">deepend</a> recently upgraded to a beefier dedi
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(more threads and more disk space) and had a bit of contract time on the old one.
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he offered to let me use it as a staging box for the meantime while i reinstalled
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and reconfigured my raid settings.</p>
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<p>i've migrated tilde.team twice before (from linode -> woothosting -> hetzner ->
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and now back to hetzner on the same box) using a slick little rsync that i've
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put together.</p>
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<p><code>
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rsync -auHxv --numeric-ids \
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--exclude=/etc/fstab \
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--exclude=/etc/network/* \
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--exclude=/proc/* \
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--exclude=/tmp/* \
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--exclude=/sys/* \
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--exclude=/dev/* \
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--exclude=/mnt/* \
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--exclude=/boot/* \
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--exclude=/root/* \
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root@oldbox:/* /
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</code></p>
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<p>as long as the destination and source boxen are running the same distro/version,
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you should be good to go after rebooting the destination box!</p>
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<p>the only thing to watch out for is running databases. it happened to me this time
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with mysql. there were 3 pending transactions that were left open during the
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rsync backup. it kept failing to start after i got the box back up, along with
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all the other services that depend on it.</p>
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<p>eventually i was able to get mysqld back up and running in recovery mode (basically
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read-only) and got a mysqldump of all databases. i then purged all existing mysql
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data, reinstalled mariadb-server, and restored the mysqldump. everything came up
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as expected and we were good to go!</p>
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<p>the raid is now in a raid0 config, leaving us with 468gb (not GiB) available
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space. thanks for tuning in to this episode of sysadmin adventures!</p>
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<p>tags: <a href='tag_tilde.html'>tilde</a>, <a href='tag_sysadmin.html'>sysadmin</a></p>
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<!-- text end -->
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<!-- entry end -->
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</div>
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<div id="footer">CC by-nc-nd <a href="https://tilde.team/~ben/">~ben</a> — <a href="mailto:ben@tilde.team">ben@tilde.team</a><br/>
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generated with <a href="https://tildegit.org/team/bashblog">bashblog</a>, a single bash script to easily create blogs like this one</div>
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