Informative

This is an interesting issue with cPanel recently faced by one of my clients. Searching on the internet brings me to an article in cPanel forum where someone else happens to also face such an issue. The solution is pretty straight forward firing the below command with the email affected.

 doveadm force-resync -u [email protected] INBOX

It seems like the inbox just needed a re-sync rather than the user third party email got deleted. This guy definitely save my ass!

Firstly you need a server/computer with a serial port. Next just fire the following command after you've connected your serial port into your machine.

screen /dev/ttyS0 19200

And it should show you your console. If it doesn't, restart your switch or just check your cable!

Find out more setting on its user guide.

well, once again i got stuck when my cluster suddenly doesn't work and i need to figure out why without restarting my server. restarting cman always throw me a stuck "Unmounting configfs..."

/etc/init.d/cman restart
Stopping cluster:
   Stopping dlm_controld... [  OK  ]
   Stopping fenced... [  OK  ]
   Stopping cman... [  OK  ]
   Unloading kernel modules... [  OK  ]
   Unmounting configfs...

running service cman status i get the following

service cman status
Found stale pid file

now i tried to stop all services that may caused this but apparently it was because the cluster is still running, hence, it wasn't able to unmount configfs

/etc/init.d/pve-cluster stop

once i've stopped my pve cluster. i tried restarting cman again

/etc/init.d/cman restart
Stopping cluster:
   Stopping dlm_controld... [  OK  ]
   Stopping fenced... [  OK  ]
   Stopping cman... [  OK  ]
   Unloading kernel modules... [  OK  ]
   Unmounting configfs... [  OK  ]
Starting cluster:
   Checking if cluster has been disabled at boot... [  OK  ]
   Checking Network Manager... [  OK  ]
   Global setup... [  OK  ]
   Loading kernel modules... [  OK  ]
   Mounting configfs... [  OK  ]
   Starting cman... [  OK  ]
   Waiting for quorum... [  OK  ]
   Starting fenced... [  OK  ]
   Starting dlm_controld... [  OK  ]
   Tuning DLM kernel config... [  OK  ]
   Unfencing self... [  OK  ]

now my cman starts running again i can start my cluster again

/etc/init.d/pve-cluster restart
Restarting pve cluster filesystem: pve-cluster.

just to make sure everything works, you can run the following

service cman status
cluster is running.

now i don't have to restart my server in order to get my cluster running again. Hope this helps!

If you are getting an error with the following error

SMTP error from remote mail server after RCPT TO:<admin @domain.com>: 550 smtp auth requried

from the script that is running on your server but the domain.com isn't locate on the same physical machine. You are most likely doing a SMTP Relay and your exim isn't really happy with not having authentication credential being provided.

In this case, you can just add the following to your exim.conf file, assuming 123.123.123.123 is your script server,

domainlist local_domains = dsearch;/etc/exim4/domains/
domainlist relay_to_domains = dsearch;/etc/exim4/domains/
hostlist relay_from_hosts = 127.0.0.1 : 123.123.123.123
hostlist whitelist = net-iplsearch;/etc/exim4/white-blocks.conf
hostlist spammers = net-iplsearch;/etc/exim4/spam-blocks.conf

you can also placed 123.123.123.123 into the file /etc/exim4/white-blocks.conf to whitelist the host on your server.

you might also need to add auth_advertise_hosts = * as show below,

host_lookup = *
auth_advertise_hosts = 123.123.123.123
rfc1413_hosts = *

which expand to all host other than localhost (of course, you might want to change it to ip instead of *)

this should allows your script to sent email using your smtp server as a relay without the need for authentication.

Another fresh issue, pretty straight forward but if you are facing this issue with the error in apache saying

libgomp: Thread creation failed: Resource temporarily unavailable, referer: https://xxxxx.org/wp-admin/media-new.php

this is most likely due to your server limit has been reached either by user level or root level. The quickest way to resolve this temporary is to increase your soft limit as shown below,

ulimit -s 999999

once you've done that. you should try upload file in WordPress and you shouldn't see the HTTP Error message. but to make this permanent after you've reboot.

Open the file located at vi /etc/security/limits.d/90-nproc.conf

*          soft    nproc     999999
root       soft    nproc     unlimited

update and change the value u see above and it should do the trick. If this doesn't do the trick, you might want to try adding the following to your .htaccess

SetEnv MAGICK_THREAD_LIMIT 1

This happens when the full installation of ImageMagick cannot be done which causes the HTTP Error to show.