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Comparing two Ceph CRUSH maps 150 150 Wido den Hollander
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Comparing two Ceph CRUSH maps

Sometimes you want to test if changes you are about to make to a CRUSH map will cause data to move or not. In this case I wanted to change a rule in CRUSH where it would use device classes,…

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HAProxy in front of Ceph Manager dashboard 150 150 Wido den Hollander
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HAProxy in front of Ceph Manager dashboard

The Ceph Mgr dashboard plugin allows for an easy dashboard which can show you how your Ceph cluster is performing. In certain situations you can’t contact the Mgr daemons directly and you have to place a Proxy server between your…

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VXLAN with VyOS and Ubuntu 18.04 150 150 Wido den Hollander
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VXLAN with VyOS and Ubuntu 18.04

VXLAN Virtual Extensible LAN uses encapsulation technique to encapsulate OSI layer 2 Ethernet frames within layer 4 UDP datagrams. More on this can be found on the link provided. For a Ceph and CloudStack environment I needed to set up…

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Placement Groups with Ceph Luminous stay in activating state 150 150 Wido den Hollander
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Placement Groups with Ceph Luminous stay in activating state

Placement Groups stuck in activating When migrating from FileStore with BlueStore with Ceph Luminuous you might run into the problem that certain Placement Groups stay stuck in the activating state. 44 activating+undersized+degraded+remapped PG Overdose This is a side-effect of the…

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Quick overview of Ceph version running on OSDs 150 150 Wido den Hollander
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Quick overview of Ceph version running on OSDs

When checking a Ceph cluster it’s useful to know which versions you OSDs in the cluster are running. There is a very simple on-line command to do this: ceph osd metadata|jq '.[].ceph_version'|sort|uniq -c Running this on a cluster which is…

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