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hydra-module: Always GC to have at least 100 GiB available.

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This commit is contained in:
Ludovic Courtès 2012-06-14 10:57:12 +02:00
parent 6411d991c7
commit 94ba1ed71f
1 changed files with 43 additions and 29 deletions
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72
hydra-module.nix
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@ -141,10 +141,9 @@ in
}
];
nix.gc.automatic = true;
# $3 / $4 don't always work depending on length of device name
nix.gc.options = ''--max-freed "$((200 * 1024**3 - 1024 * $(df /nix/store | tail -n 1 | awk '{ print $3 }')))"'';
# We have our own crontab entries for GC, see below.
nix.gc.automatic = false;
nix.extraOptions = ''
gc-keep-outputs = true
gc-keep-derivations = true
@ -200,30 +199,45 @@ in
};
services.cron.systemCronJobs =
let
# If there is less than ... GiB of free disk space, stop the queue
# to prevent builds from failing or aborting.
checkSpace = pkgs.writeScript "hydra-check-space"
''
#! /bin/sh
if [ $(($(stat -f -c '%a' /nix/store) * $(stat -f -c '%S' /nix/store))) -lt $((${toString cfg.minimumDiskFree} * 1024**3)) ]; then
stop hydra_queue_runner
fi
if [ $(($(stat -f -c '%a' /nix/store) * $(stat -f -c '%S' /nix/store))) -lt $((${toString cfg.minimumDiskFreeEvaluator} * 1024**3)) ]; then
stop hydra_evaluator
fi
'';
compressLogs = pkgs.writeScript "compress-logs" ''
#! /bin/sh -e
touch -d 'last month' r
find /nix/var/log/nix/drvs -type f -a ! -newer r -name '*.drv' | xargs bzip2 -v
'';
in
[ "*/5 * * * * root ${checkSpace} &> ${cfg.baseDir}/data/checkspace.log"
"15 5 * * * root ${compressLogs} &> ${cfg.baseDir}/data/compress.log"
"15 02 * * * ${cfg.user} ${env} ${cfg.hydra}/bin/hydra-update-gc-roots &> ${cfg.baseDir}/data/gc-roots.log"
];
let
# If there is less than ... GiB of free disk space, stop the queue
# to prevent builds from failing or aborting.
checkSpace = pkgs.writeScript "hydra-check-space"
''
#! /bin/sh
if [ $(($(stat -f -c '%a' /nix/store) * $(stat -f -c '%S' /nix/store))) -lt $((${toString cfg.minimumDiskFree} * 1024**3)) ]; then
stop hydra_queue_runner
fi
if [ $(($(stat -f -c '%a' /nix/store) * $(stat -f -c '%S' /nix/store))) -lt $((${toString cfg.minimumDiskFreeEvaluator} * 1024**3)) ]; then
stop hydra_evaluator
fi
'';
};
collect = pkgs.writeScript "collect-some-garbage"
# Arrange to always have at least 100 GiB free.
'' #!/bin/sh -e
available="$(df -B1 /nix/store | tail -n 1 | awk '{ print $4 }')"
target="$((100 * 1024**3))"
to_free="$(($available > $target ? 200 * 1024**2 : $target - $available))"
echo "$available B available, and targeting $target B available"
echo "thus, freeing $to_free B"
exec "${pkgs.nix}/bin/nix-collect-garbage" --max-freed "$to_free"
'';
compressLogs = pkgs.writeScript "compress-logs" ''
#! /bin/sh -e
touch -d 'last month' r
find /nix/var/log/nix/drvs -type f -a ! -newer r -name '*.drv' | xargs bzip2 -v
'';
in
[ "15 03 * * * root ${collect} &> ${cfg.baseDir}/data/gc.log"
"15 13 * * * root ${collect} &> ${cfg.baseDir}/data/gc.log"
"*/5 * * * * root ${checkSpace} &> ${cfg.baseDir}/data/checkspace.log"
"15 5 * * * root ${compressLogs} &> ${cfg.baseDir}/data/compress.log"
"15 02 * * * ${cfg.user} ${env} ${cfg.hydra}/bin/hydra-update-gc-roots &> ${cfg.baseDir}/data/gc-roots.log"
];
};
}