[SOLVED] Mongodb refuses to start

camorri · 05-07-2024, 09:49 AM

I have installed allienbobs Mongodb package on Slackware 15.0. I have followed the instructions on this link:

https://alien.slackbook.org/blog/how...-on-slackware/

Here are the results:

Code:

root@duelie:~# /etc/rc.d/rc.mongodb start
about to fork child process, waiting until server is ready for connections.
forked process: 5818
ERROR: child process failed, exited with 1
To see additional information in this output, start without the "--fork" option.
MongoDB server failed to start, exiting now...

I edited /etc/mongod.conf and changed the "fork" to false, and receivd even less informaiton on what is wrong.

Here is the last error line from mongod.log.

Code:

{"t":{"$date":"2024-05-07T10:35:37.054-04:00"},"s":"I",  "c":"CONTROL",  "id":23330,   
82 "ctx":"main","msg":"ERROR: Cannot write pid file to {path_string}: {errAndStr_second}",
83 "attr":{"path_string":"/var/run/mongodb/mongod.pid","errAndStr_second":"No such file or directory"}}

Any help would be appreciated. I have no experience with data base programs.

ponce · 05-07-2024, 09:57 AM

could it be you are missing the needed user:group to use the package?

if you haven't done it already and the user and group mongo are not already in your system (you can check with "grep mongo /etc/{passwd,group}") run these two commands

Code:

groupadd -g 285 mongo
useradd -g 285 -u 285 -M -d /var/lib/mongodb -s /bin/false mongo

then reinstall Alien Bob's package and try again to restart it via the rc script.

camorri · 05-07-2024, 10:04 AM

The user and gropup got created by the install. I have check the presence of other files in /etc. I have a login.defs file, a mongod.conf file and a mongodb.conf file. User mongo I can log into from a shell. ( I think that is the way it is supposed to be.)

I have the deps installed Alienbob has posted.

Quote:

ls -l /var/lib/pkgtools/packages | grep python-cheetah3
-rw-r--r-- 1 root root 21K May 1 09:39 python-cheetah3-3.2.6-x86_64-1alien
(Tue May-5 11:18:52am)-(CPU 0.0%:0:Net 33)-(cliff:~)-(86M:199)
> ls -l /var/lib/pkgtools/packages | grep python-psutil
-rw-r--r-- 1 root root 9.6K May 1 09:40 python-psutil-5.6.7-x86_64-1alien
(Tue May-5 11:22:39am)-(CPU 0.0%:0:Net 34)-(cliff:~)-(86M:199)
> ls -l /var/lib/pkgtools/packages | grep python-yaml
-rw-r--r-- 1 root root 5.1K May 1 09:40 python-yaml-5.3.1-x86_64-1alien

ponce · 05-07-2024, 10:33 AM

I asked because the error shown is "Cannot write pid file to {path_string}" and "path_string":"/var/run/mongodb/mongod.pid","errAndStr_second":"No such file or directory": that could happen because the path /var/run/mongodb either doesn't exist or because it has not the right owner/permissions...

camorri · 05-07-2024, 10:39 AM

You are correct, there was no mongodb dir in /var/run/. I have created it by root user, not sure who has to own it though. root:root ownership has not changed the result.

ponce · 05-07-2024, 10:46 AM

Quote:

Originally Posted by camorri

You are correct, there was no mongodb dir in /var/run/. I have created it by root user, not sure who has to own it though. root:root ownership has not changed the result.

then there's something wrong in the rc.mongodb you are using: it should create the directory itself and apply the correct ownership (mongo:mongo) and permissions.
I think you are using another rc.mongodb different from the one provided by the Alien Bob's package.

maybe the right one is called /etc/rc.d/rc.mongodb.new because when you installed Alien Bob's mongodb package there was already an /etc/rc.d/rc.mongodb present in your system.

willysr · 05-07-2024, 11:24 AM

or you can try to compare it with the one provided in SBo

camorri · 05-07-2024, 12:25 PM

I created the dir, /var/run/mongodb and chown to mongo:mongo and:

Quote:

root@duelie:/var/run# /etc/rc.d/rc.mongodb start
about to fork child process, waiting until server is ready for connections.
forked process: 5054
child process started successfully, parent exiting
MongoDB server started successfully.

Thank-you all.

volkerdi · 05-07-2024, 02:31 PM

Quote:

Originally Posted by camorri

I created the dir, /var/run/mongodb and chown to mongo:mongo and:

Something to note is that /var/run is a symlink to /run, which is a tmpfs. When you reboot, the directory will no longer be there.

The usual solution for this is to have the rc script create the directory.