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+Intro:
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+
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+Even tho CMK itself advises against it, under some conditions this still is a viable option.
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+So to show how, i’ve written this small tutorial.
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+
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+Assumptions:
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+
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+ a running LXC-Container with a supported OS for CheckMK on Proxmox.
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+ basic setup of CheckMK (any edition) - with atleast one site configured.
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+
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+Issues (without further configuration)
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+
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+ Temporary filesystem will give a warning - indicating performance is not optimal when doing a (re-)start.
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+
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+Creating temporary filesystem /omd/sites/testsite/tmp...mount: /opt/omd/sites/testsite/tmp: can't find in /etc/fstab.
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+WARNING: You may continue without tmpfs, but the performance of Check_MK may be degraded.
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+
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+Solution:
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+
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+For every configured site on the box edit (even if it does not exist) with your favorite editor /etc/fstab and enter the following information (per-site):
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+
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+tmpfs /opt/omd/sites/<yoursitename>/tmp tmpfs noauto,user,mode=755,uid=<yoursitename>,gid=<yoursitename>2 0 0
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+
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+After having made these adjustment you will have to restart the box.
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+
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+Result:
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+
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+ you now have a temporary filesystem in place for a/the sites you are running without OMD complaining about missing tmpfs.
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+
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+Happy monitoring !
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