[pve-devel] [RFC OPTIONAL pve-cluster 1/1] add arcsize to rrd

[Matthias Heiserer]

On 15.03.2023 12:51, Matthias Heiserer wrote:
> On 15.03.2023 12:10, Dominik Csapak wrote:
>> hi not sure we would want to do it this way, since
>> this will only work for the node where the new pve-cluster
>> is installed, the other nodes will not be able to update their
>> local database with the info from the new nodes
>>
>> AFAIR, the way we dealt with rrd updates in the past is
>> that we introduced a new db (like pve2.3-vm) which is also
>> not available on older nodes, but it does not error out, since
>> it won't match and we don't try to update it
> I thought I had tested that and it would just discard the value, instead 
> of erroring. but I'll check again, not sure rn
tested it, it indeed does not work, but no error is being logged

i guess a separate db is the next best option
>>
>> On 1/25/23 12:29, Matthias Heiserer wrote:
>>> To modify the existing rrd store, rrdtool is required
>>>
>>> Signed-off-by: Matthias Heiserer <m.heiserer at proxmox.com>
>>> ---
>>>   data/src/status.c           | 1 +
>>>   debian/control              | 1 +
>>>   debian/pve-cluster.postinst | 6 ++++++
>>>   3 files changed, 8 insertions(+)
>>>   create mode 100644 debian/pve-cluster.postinst
>>>
>>> diff --git a/data/src/status.c b/data/src/status.c
>>> index 5e1e841..9290141 100644
>>> --- a/data/src/status.c
>>> +++ b/data/src/status.c
>>> @@ -1130,6 +1130,7 @@ static const char *rrd_def_node[] = {
>>>       "DS:rootused:GAUGE:120:0:U",
>>>       "DS:netin:DERIVE:120:0:U",
>>>       "DS:netout:DERIVE:120:0:U",
>>> +    "DS:arcsize:GAUGE:120:0:U",
>>>       "RRA:AVERAGE:0.5:1:70", // 1 min avg - one hour
>>>       "RRA:AVERAGE:0.5:30:70", // 30 min avg - one day
>>> diff --git a/debian/control b/debian/control
>>> index 2d5a01f..22d96c2 100644
>>> --- a/debian/control
>>> +++ b/debian/control
>>> @@ -37,6 +37,7 @@ Depends: corosync (>= 2.3.4-1),
>>>            libsqlite3-0,
>>>            sqlite3,
>>>            systemd,
>>> +         rrdtool,
>>>            ${misc:Depends},
>>>            ${perl:Depends},
>>>            ${shlibs:Depends},
>>> diff --git a/debian/pve-cluster.postinst b/debian/pve-cluster.postinst
>>> new file mode 100644
>>> index 0000000..cf475cc
>>> --- /dev/null
>>> +++ b/debian/pve-cluster.postinst
>>> @@ -0,0 +1,6 @@
>>> +#!/bin/bash
>>> +
>>> +RRD_DB="/var/lib/rrdcached/db/pve2-node/`hostname`"
>>> +if [ -f $RRD_DB ] && [ `rrdtool info $RRD_DB | grep -q arcsize` ]; then
>>> +        rrdtool tune $RRD_DB 'DS:arcsize:GAUGE:120:0:U'
>>> +fi
>>
>>
>>
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>>
> 
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