El día Monday, July 24, 2023 a las 01:30:56PM +0200, Matthias Apitz escribió:
>
> Hello,
>
> I've installed a fresh Jenkins jenkins-2.401.2-1.1.noarch.rpm on a RH8
> server without the old jobs and config (not moved from the old server).
>
> The server starts fine and when I connect with the browser to port 8080,
> I'm asked for a first administrator password from the file
> /var/lib/jenkins/secrets/initialAdminPassword
> When I provide it, the page in the browser only presents some ongoing
> pattern, three small vertical bars which are moving up and down, but
> nothing more.
>
> ...
UPDATE:
I spent a lot of time in tracing with tcpdump and Linux' strace to
understand what is going on between the browser and Jenkins, and also
between Jenkins and resources in Internet:
After providing the initial admin password from the browser to Jenkins,
there is some HTTP dialog between the browser and Jenkins server;
the browser sends a lot of all the same requests of the form
GET /updateCenter/connectionStatus?siteId=default...
# egrep 'HTTP: GET /update' tcp2 | wc -l
2283
i.e. thousands of such requests!
The jenkins server itself is requesting data from two servers in
Internet:
# grep 142.250.181.228 tcp2 | grep '\[S'
10:51:26.222340 IP 10.201.64.28.48674 > 142.250.181.228.https: Flags [S], seq
2438595054, win 29200, options [mss 1460,sackOK,TS val 1475725650 ecr
0,nop,wscale 7], length 0
# grep 52.202.51.185 tcp2 | grep '\[S'
10:51:26.236951 IP 10.201.64.28.41834 > 52.202.51.185.https: Flags [S], seq
3893898537, win 29200, options [mss 1460,sackOK,TS val 1476244307 ecr
0,nop,wscale 7], length 0
10:51:26.327508 IP 52.202.51.185.https > 10.201.64.28.41834: Flags [S.], seq
351494233, ack 3893898538, win 62643, options [mss 1460,sackOK,TS val
3802601119 ecr 1476244307,nop,wscale 7], length 0
11:07:24.055143 IP 10.201.64.28.46718 > 52.202.51.185.https: Flags [S], seq
3933852832, win 29200, options [mss 1460,sackOK,TS val 1477202126 ecr
0,nop,wscale 7], length 0
11:07:24.146115 IP 52.202.51.185.https > 10.201.64.28.46718: Flags [S.], seq
2048943343, ack 3933852833, win 62643, options [mss 1460,sackOK,TS val
3803558940 ecr 1477202126,nop,wscale 7], length 0
The latter is to be configured in the file:
# cat hudson.model.UpdateCenter.xml
<?xml version='1.1' encoding='UTF-8'?>
<sites>
<site>
<id>default</id>
<url>https://updates.jenkins.io/update-center.json</url>
</site>
</sites>
The first I have no idea, where is this configured.
The box is sitting in some data center and is not fully connected to
Internet... How could those external request to Internet be switched off?
The browser is still sending those GET requests, already 3181 for 30
minutes or so.
matthias
--
Matthias Apitz, ✉ g...@unixarea.de, http://www.unixarea.de/ +49-176-38902045
Public GnuPG key: http://www.unixarea.de/key.pub
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