Coherence: Difference between revisions

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<div class="borderc5 backgroundc2" style="padding:0; margin:0 0 0.5em 0; border-style:solid; border-width:medium">
{| width="100%" align="center" style="text-align:left; "
| style="align:left;" | [[Image:Nuvola apps important.svg|25px|Outdated]]
| style="padding-left:5px;" | '''IMPORTANT:''' Coherence is now defunct and has been replaced by a much powerful server called [[Erratic]]
|}</div>
{{Inventory
{{Inventory
|Name=Asrock J4205 Coherence
|Name=Coherence
|Owner=Space
|Owner=Space
|Status=Infra
|Status=Infra
|Hostname=coherence
|Hostname=coherence
|Location=
|Picture=Coherence_Optiplex.jpg
|Picture=Coherence.JPG
|Tool=No
|Tool=No
}}
}}
== Replacement ==
Replaced by [[Erratic]].
== What and where ==
* Runs Proxmox for KVM VMs and LXC containers
* https://coherence.lan.nurd.space:8006/
== Specs ==
== Specs ==
* Dell Optiplex 7010 donated by TechInc
* 4x 4GB RAM (all slots filled)
* Intel Core i5 3470 @ 3.2ghz
* 2 x 4TB Toshiba disks
* 120GB SSD for root etc
== Old specs (this box broke) ==
* Asrock J4205-ITX
* Asrock J4205-ITX
* 2 x 8GB DDR3 1866Mhz
* 2 x 8GB DDR3 1866Mhz
* 2 x 4TB Toshiba disks
* 2 x 4TB Toshiba disks
* 120GB SSD for root etc
* 120GB SSD for root etc
* +- 25W power usage total (with one spinning disk)


== Services ==
== Tips&Tricks ==
* proxmox for VMs
=== Find the container id of a running process ===
* ...
Since it is always an issue to find out to which LXC container some process belongs, a small helper script has been created which helps with finding this ID.


* https://coherence.lan.nurd.space:8006/
Example run:
<pre>
root@coherence:~# find_pct_by_pid.sh 12088
105
root@coherence:~# find_pct_by_pid.sh 666
Error: No /proc entry found for 666
root@coherence:~# find_pct_by_pid.sh 1
Warning: 1 is not running inside an LXC container
</pre>
 
Script:
<pre>
#!/bin/bash
 
# Check if we are called correctly
if [[ ${#} -ne 1 ]]; then
  echo "Usage: $(basename ${0}) <pid>"
  exit 1
fi
PID=${1}
 
# Check if the process is actually running
if [[ ! -d "/proc/${PID}" ]]; then
  echo "Error: No /proc entry found for ${PID}"
  exit 1
fi
 
# Check if we are dealing with an LXC container
CPUSET="$(head -1 /proc/${PID}/cpuset)"
echo "${CPUSET}" | grep -q lxc
if [[ ${?} -ne 0 ]]; then
  echo "Warning: ${PID} is not running inside an LXC container"
  exit 0
fi
 
PCT_ID="$(echo ${CPUSET} | cut -d/ -f3)"
 
echo "${PCT_ID}"
</pre>

Latest revision as of 21:28, 9 May 2022

Outdated IMPORTANT: Coherence is now defunct and has been replaced by a much powerful server called Erratic


Coherence
Coherence Optiplex.jpg
Owner Space
Status Infra
Hostname coherence
Tool No
Tool category

Coherence

Coherence_Optiplex.jpg {{{InventoryOwner}}}Property "Tool Owner" (as page type) with input value "{{{InventoryOwner}}}" contains invalid characters or is incomplete and therefore can cause unexpected results during a query or annotation process. {{{Location}}}Property "Tool Location" (as page type) with input value "{{{Location}}}" contains invalid characters or is incomplete and therefore can cause unexpected results during a query or annotation process.

Replacement

Replaced by Erratic.

What and where

Specs

  • Dell Optiplex 7010 donated by TechInc
  • 4x 4GB RAM (all slots filled)
  • Intel Core i5 3470 @ 3.2ghz
  • 2 x 4TB Toshiba disks
  • 120GB SSD for root etc

Old specs (this box broke)

  • Asrock J4205-ITX
  • 2 x 8GB DDR3 1866Mhz
  • 2 x 4TB Toshiba disks
  • 120GB SSD for root etc
  • +- 25W power usage total (with one spinning disk)

Tips&Tricks

Find the container id of a running process

Since it is always an issue to find out to which LXC container some process belongs, a small helper script has been created which helps with finding this ID.

Example run:

root@coherence:~# find_pct_by_pid.sh 12088
105
root@coherence:~# find_pct_by_pid.sh 666
Error: No /proc entry found for 666
root@coherence:~# find_pct_by_pid.sh 1
Warning: 1 is not running inside an LXC container

Script:

#!/bin/bash

# Check if we are called correctly
if [[ ${#} -ne 1 ]]; then
  echo "Usage: $(basename ${0}) <pid>"
  exit 1
fi
PID=${1}

# Check if the process is actually running
if [[ ! -d "/proc/${PID}" ]]; then
  echo "Error: No /proc entry found for ${PID}"
  exit 1
fi

# Check if we are dealing with an LXC container
CPUSET="$(head -1 /proc/${PID}/cpuset)"
echo "${CPUSET}" | grep -q lxc
if [[ ${?} -ne 0 ]]; then
  echo "Warning: ${PID} is not running inside an LXC container"
  exit 0
fi

PCT_ID="$(echo ${CPUSET} | cut -d/ -f3)"

echo "${PCT_ID}"