How to fix the 500 error on roundcube

/usr/local/cpanel/bin/update-roundcube –force

How to install postfix on Ubuntu

sudo apt-get install postfix

sudo dpkg-reconfigure postfix  sudo postconf -e 'home_mailbox = Maildir/'  sudo /etc/init.d/postfix restart  sudo apt-get install dovecot-common  sudo apt-get install dovecot-imapd 

sudo apt-get install dovecot-pop3d 

 sudo useradd -d /home/testuser -m testuser

sudo passwd testuser

How to increase the memory for PHPmyadmin in cPanel server

vi  /usr/local/cpanel/3rdparty/etc/php.ini

and change
upload_max_filesize = 150M
post_max_size = 150M

then run in SSH

/usr/local/cpanel/bin/install_php_inis


service cpanel restart

Looking to increase the /tmp on the linux server?

or getting frequent Mysql error due to /tmp running out of steps ?

below are the steps to increased /tmp partition,

##Stop Mysql in server##

/etc/init.d/mysql stop
###Find and kill the tailwatchd process###

pstree -p | grep tailwatchd
kill -9  < process ID>

#### Copy the /tmp to backup###

cp -prf /tmp /tmp.bak

###Set the /tmp to 2GB now###

dd if=/dev/zero of=/usr/tmpDSK bs=1024k count=2048

###Now find the size of tmp partition###

du -sch /usr/tmpDSK

### unmount /tmp partition

umount /tmp

###Format the /tmp partition###

mkfs -t ext3 /usr/tmpDSK

###Remount in secure environment###

/scripts/securetmp

###Now check size it should be 2GB###

df -h

Upgrading openssl in cpanel is considered dangerous as it breaks the system

We tried in one of our system and came out in flying colors … yes we were able to upgrade susccessfully

We upgraded to openssl 1.0 version for cpanel

below are the steps

tar -xvzf openssl-1.0.0d.tar.gz

cd openssl-1.0.0d
./configure
make

make test
make install

cd include/openssl
cp  -r * /usr/include
cp  -r * /usr/local/ssl/include
cp -r * /usr/local/ssl/include/openssl

cp -r lib* /usr/local/ssl/lib/
cp -r lib* /usr/lib/

When this is complete enter command  ldconfig

now you can open /etc/yum.conf and add in excluded list openssl*

Now run easyapache and all should work fine

If you want to reduce the memory and cpu consumption of Apache.

Add the below parameter,

RLimitNPROC 40

To prevent apach being overwritten run the below command,

/usr/local/cpanel/bin/apache_conf_distiller –update

Now you are done.

While installing if you get an error

“Failed to download pear/HTTP_OAuth within preferred state “stable”, latest release is version 0.1.18, stability “alpha”, use “channel://pear.php.net/HTTP_OAuth-0.1.18″ to install
install failed ”

Use the below command to install it successfully.

pear install HTTP_OAuth-alpha

You will get below results,

root@hillock [~]# pear install HTTP_OAuth-alpha
Did not download optional dependencies: pecl/pecl_http, use –alldeps to download automatically
pear/HTTP_OAuth can optionally use package “pecl/pecl_http” (version >= 1.6.0)
pear/HTTP_Request2 can optionally use PHP extension “fileinfo”
downloading HTTP_OAuth-0.1.18.tgz …
Starting to download HTTP_OAuth-0.1.18.tgz (51,237 bytes)
………….done: 51,237 bytes
downloading HTTP_Request2-0.5.2.tgz …
Starting to download HTTP_Request2-0.5.2.tgz (58,159 bytes)
…done: 58,159 bytes
downloading Net_URL2-0.3.1.tgz …
Starting to download Net_URL2-0.3.1.tgz (8,488 bytes)
…done: 8,488 bytes
install ok: channel://pear.php.net/Net_URL2-0.3.1
install ok: channel://pear.php.net/HTTP_Request2-0.5.2
install ok: channel://pear.php.net/HTTP_OAuth-0.1.18

PS domain.tld is your domain name.

Check the domain entry in below file ,

grep domain.tld /etc/named.conf

if present use /scripts/killdns  domain.tld

grep domain.tld /etc/userdomains

grep domain.tld /usr/local/apache/conf/http.conf

grep domain.tld /etc/localdomains

grep domain.tld /etc/remotedomains

Once your remove the file entry run /scripts/updateuserdomains to sync it.

Done now you can add addon domain .

To stop apache from consuming more cpu you can enter the limitations on it,

use the below parameter on values you need,

RLimitCPU 50, 100

50,100 is  softlimit and a hard limit in seconds

This would prevent the run away scripts from taking down the server.

You may well be tired of downtime and looking to optimize Apache and Mysql for your server.

Use the below steps,

Configure   Apache to use  mpm_prefork Module using easypache

vi  /usr/local/apache/conf/httpd.conf

Search for  <IfModule prefork.c>

In this add the below parameters,

ServerLimit 1000
KeepAlive On
KeepAliveTimeout 60
MaxClients 1500

MaxSpareServers 200

MinSpareServers 50

</ifmodule>

Run the below command to keep the cpanel from over writing the apache configuration.

/usr/local/cpanel/bin/apache_conf_distiller –update

service httpd restart

Well you are done with apache optimization

There maybe many more optimization but this is a general one.