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Learning the Wikimedia stack!

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Documentation

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Lists

Questions

How does refine use salts? https://gerrit.wikimedia.org/r/c/operations/puppet/+/679939

Is /system a default directory for hadoop, or can we remove it?

Is there a place that lists the vlans?

How to check vlan for a host?

Q: Is it expected that when reimaging a host, we see the old name when running homer?

[edit interfaces interface-range disabled]
-    member ge-1/0/13;
[edit interfaces interface-range vlan-analytics1-d-eqiad]
+    member ge-1/0/13;
     member ge-1/0/43 { ... }
[edit interfaces]
+   ge-1/0/13 {
+       description "db1125 {#2221}";
+   }

^ this is while decommissioning db1125

A: No, I skipped some netbox steps; when I fixed them this didn't show up

Q: How to submit a test job to the yarn queue to test if it is accepting jobs?

Q: What to do about this warning on analytics1068?

May 06 21:03:35 analytics1068 systemd[1]: /run/systemd/generator.late/hadoop-yarn-nodemanager.service:18: PIDFile= late/hadoop-yarn-nodemanager.service:18: PIDFile= references path below legacy directory /var/run/, updating /var/run/hadoop-yarn/yarn-yarn-nodemanager.pid → /run/hadoop-yarn/yarn-yarn-nodemanager.pid → /run/hadoop-yarn/yarn-yarn-nodemanager.pid; please update the unit file accordingly.

Q: Server Lifecycle#Rename while reimaging when to merge homer patch?

A: homer patch is for firewall, not having to do with the reimaging process. Merge after reimage complete

Q: What is the order for creating puppet patches when it comes to server lifecycle? Some things that might need to be avoided: having site.pp for node that is being decommissioned, having site.pp for node that doesn't exist yet

Ideas

Script to show what tickets are currently in progress

Add homer-public to codesearch

Remove legacy analytics-hadoop from grafana

Random notes

sudo lsof -Xd DEL - lists the files that have been deleted but are still held open by a running process

Puppet

https://www.digitalocean.com/community/tutorials/getting-started-with-puppet-code-manifests-and-modules

Why does sshing into mgmt not accept the password?

Because you forgot the `root@` part!

Instead of ssh dbstore1007.mgmt.e

do `ssh root@dbstore1007.mgmt.e`

Or make ssh use the root user in your ~/.ssh/config: https://stackoverflow.com/questions/10197559/ssh-configuration-override-the-default-username

refactor this to run automatically

https://wikitech.wikimedia.org/wiki/Analytics/Systems/AQS#Deploy_new_History_snapshot_for_Wikistats_Backend

Why no homer diff?

TBD

how to check what vlan a host belongs to?

???

Proposal: stop using conda for infrastructure

Why not use standard pip?

How to apply hadoop config changes?

For example https://gerrit.wikimedia.org/r/c/operations/puppet/+/698194/1/hieradata/common.yaml

linux-host-entries.ttyS0-115200 versus linux-host-entries.ttyS1-115200

a mystery

sudo gnt-instance console an-airflow1002.eqiad.wmnet is stuck, is this normal?

?

@@ Line 113: / Line 113: @@
 For example https://gerrit.wikimedia.org/r/c/operations/puppet/+/698194/1/hieradata/common.yaml
+== linux-host-entries.ttyS0-115200 versus linux-host-entries.ttyS1-115200 ==
+a mystery
+== sudo gnt-instance console an-airflow1002.eqiad.wmnet is stuck, is this normal? ==
+?