mirror of
https://github.com/schoebel/mars
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120 lines
3.6 KiB
Bash
Executable File
120 lines
3.6 KiB
Bash
Executable File
#!/bin/bash
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#
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# This file is part of MARS project: http://schoebel.github.io/mars/
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#
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# Copyright (C) 2015 Thomas Schoebel-Theuer
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# Copyright (C) 2015 1&1 Internet AG
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License along
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# with this program; if not, write to the Free Software Foundation, Inc.,
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# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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############################################################
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# TST summer 2015 lab prototype
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const_fetch_warn=${const_fetch_warn:-20000} # KiB
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const_replay_warn=${const_replay_warn:-500000} # KiB
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# Allow overrides of default values by external config file
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for path in {.,$HOME,/etc/defaults}/check-mars-switchable.conf; do
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[[ -r $path ]] && . $path
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done
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# Global precondition: the mars kernel module must be loaded.
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if ! [[ -d /proc/sys/mars ]]; then
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echo "ERROR: mars kernel module is not loaded"
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exit 1
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fi
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# This script works on a single resource, or on "all".
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# When no argument is given, treat as "all".
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if [[ "$1" = "all" ]] || [[ "$1" = "" ]] ; then
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rc=0
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for resource in $(marsadm view-my-resources); do
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$0 $resource || (( rc++ ))
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done
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exit $rc
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fi
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resource="$1"
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# Check whether the resource is attached.
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if (( $(marsadm view-is-attach $resource) < 1 )); then
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echo "ERROR: resource '$resource' is not attached"
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exit 1
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fi
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# Check whether the resource is already Primary.
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# In this case, we simply say "OK", because it will do no harm
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# if you switch something to Primary which is already Primary.
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# Alternatively, you may place an error here.
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if (( $(marsadm view-is-primary $resource) > 0 )); then
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echo "OK: resource '$resource' is already Primary. Nothing to do."
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exit 0
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fi
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# Check whether sync has finished
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if (( $(marsadm view-sync-rest $resource) > 0 )); then
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echo "ERROR: resource '$resource' has not reached sync"
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exit 1
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fi
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# Check whether consistency has been violated
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if (( $(marsadm view-is-consistent $resource) < 1 )); then
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echo "ERROR: resource '$resource' is not (yet) consistent"
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exit 1
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fi
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# Check whether the current primary can be reached over network.
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# We issue a warning only.
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if (( $(marsadm view-is-alive $resource) < 1 )); then
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echo "WARNING: the current Primary '$(marsadm view-get-primary $resource)' of resource '$resource' cannot be reached currently. You may need --force if you really want to switch anyway."
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fi
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# Check split brain.
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# We issue a warning only.
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if (( $(marsadm view-is-split-brain $resource) > 0 )); then
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echo "WARNING: resource '$resource' is in split brain mode. Switching via --force should be possible, but be sure to switch to the correct side."
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fi
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# Check fetch and replay margins.
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# We issue a warning only.
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for mode in fetch replay; do
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limit=$(eval echo \$const_${mode}_warn)
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# disable the check if the limit is zero
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(( limit <= 0 )) && continue
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# convert units from bytes to KiB
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value=$(( $(marsadm view-$mode-rest $resource) / 1024 ))
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if (( value > limit )); then
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echo "WARNING: resource '$resource' has $mode lagbehind: $value > $limit KiB"
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fi
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done
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# Finally: no errors found
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echo "OK: nothing speaks against switching resource '$resource' at generic mars level."
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exit 0
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