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Article Number: 000050422

Isilon Process httpd of service isi_webui has failed to restart after multiple attempts - Event ID: 400030001

Summary: OneFS WebUI will be in accessible if the webui_httpd.conf file is stale.

Article Content

Symptoms



The OneFS WebUI will be inaccessible if the webui_httpd.conf file under /var/run/apache2/ became stale on the problematic node:

isilon-1# ps axuww | grep httpd | grep -v grep
root   43633   0.0  0.5 170644 10188  -  Ss    2:49PM     0:00.06 /usr/local/apache2/bin/httpd -k start
daemon 43634   0.0  0.5 170332  9840  -  I     2:49PM     0:00.00 /usr/local/apache2/bin/httpd -k start
daemon 43638   0.0  0.6 174360 11652  -  I     2:49PM     0:00.00 /usr/local/apache2/bin/httpd -k start
<<< the output is missing "/usr/local/apache2/bin/httpd -f /usr/local/apache2/conf/webui_httpd.conf -k start" thread. There should be 3 or more threads on each node

Attempting to manually start httpd of isi_webui service would result in the following message:

isilon-1# /usr/local/sbin/webui_httpd_ctl start
httpd: Could not reliably determine the server's fully qualified domain name, using 27.27.27.102 for ServerName
httpd (pid 72923) already running

isilon-1# cat /var/apache2/run/webui_httpd.pid
72923

Cause

If a node is restarted unexpectedly or if the webui process is killed in certain ways, the pid files are left. When webui is restarted either via MCP or via a node reboot, webui may not start correctly, emitting the error:
> httpd (pid 72923) already running
(where 72923 was the pid of the previously-running webui daemon)

Resolution

SSH to the problematic node with "root" account. 
Verify if webui_httpd.pid exists:
# ls -l /var/apache2/run/webui_httpd.pid

If it does, remove that .pid file with the below command:
# cd /var/apache2/run/; rm -f webui_httpd.pid
- Attempt to start httpd again with
# /usr/local/sbin/webui_httpd_ctl start

After following the steps above, the output should be similar to the below where there should be 3 or more httpd of webui threads:

jv8004-1# ps axuww | grep "webui_httpd.conf" | grep -v grep
root    3135   0.0  0.6 261704 13280  -  Ss    4Apr18     0:18.62 /usr/local/apache2/bin/httpd -f /usr/local/apache2/conf/webui_httpd.conf -k start
daemon  3140   0.0  0.6 261668 13268  -  I@    4Apr18     0:00.23 /usr/local/apache2/bin/httpd -f /usr/local/apache2/conf/webui_httpd.conf -k start
daemon  3145   0.0  1.5 307568 30924  -  I     4Apr18     0:10.58 /usr/local/apache2/bin/httpd -f /usr/local/apache2/conf/webui_httpd.conf -k start

Try to log in to the web administration on problematic node after the above steps are taken.

Article Properties

Affected Product

Isilon

Product

Isilon, PowerScale OneFS

Last Published Date

20 Nov 2020

Version

2

Article Type

Solution

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