Tag: CentOS

Install OpenLiteSpeed on CentOS

To install OpenLiteSpeed web server on CentOS, install repository for your CentOS version

For CentOS 6

rpm -Uvh http://rpms.litespeedtech.com/centos/litespeed-repo-1.1-1.el6.noarch.rpm

For CentOS 7

rpm -Uvh http://rpms.litespeedtech.com/centos/litespeed-repo-1.1-1.el7.noarch.rpm

For CentOS 8

rpm -Uvh http://rpms.litespeedtech.com/centos/litespeed-repo-1.1-1.el8.noarch.rpm

To install OpenLiteSpeed, run

yum install openlitespeed

Before you can install PHP, you need epel repository enabled with

yum install epel-release

Install PHP with

yum install lsphp73 lsphp73-common lsphp73-mysql lsphp73-gd lsphp73-process lsphp73-mbstring lsphp73-xml lsphp73-mcrypt lsphp73-pdo lsphp73-imap lsphp73-soap lsphp73-bcmath lsphp73-json lsphp73-mysqlnd

Set symlink

ln -sf /usr/local/lsws/lsphp73/bin/lsphp /usr/local/lsws/fcgi-bin/lsphp5

Start OpenLiteSpeed with

/usr/local/lsws/bin/lswsctrl start

To stop OpenLiteSpeed, run

/usr/local/lsws/bin/lswsctrl stop

By default, OpenLiteSpeed will run on port 8088

http://YOUR_SERVER_IP_HERE:8088

You can login to Admin Interface at

http://YOUR_SERVER_IP_HERE:7080
User = admin
PW = 123456

By default, you see an example application. The configuration file for this is at

/usr/local/lsws/conf/vhosts/Example/vhconf.conf

Default DocumentRoot is /usr/local/lsws/Example/html. To change, edit file

vi /usr/local/lsws/conf/vhosts/Example/vhconf.conf

Find

docRoot $VH_ROOT/html/

Replace $VH_ROOT/html/ with whatever path you need. You need to restart OpenLiteSpeed to make the change go live

/usr/local/lsws/bin/lswsctrl restart

December 13, 2019

CentOS 7 VestaCP Upgrade PHP to 7.x

On CentOS 7 VestaCP install PHP 5.6 by default. This is very old version of PHP. To upgrade PHP to latest version 7.x, you can install remi repo.

Install EPEL repo

yum install -y epel-release

Install yum-utils

yum install -y yum-utils

Install remi repo

rpm -ivh http://rpms.remirepo.net/enterprise/remi-release-7.rpm

Select PHP version you need

yum-config-manager --enable remi-php73

Here i selected PHP 7.3. You can select differnt PHP versions with commands like.

yum-config-manager --enable remi-php56
yum-config-manager --enable remi-php71
yum-config-manager --enable remi-php72
yum-config-manager --enable remi-php73
yum-config-manager --enable remi-php74

Make sure you only enable one PHP version. If you enabled a PHP version from remi repo, disable it with

yum-config-manager --disable remi-php56
yum-config-manager --disable remi-php70
yum-config-manager --disable remi-php71
yum-config-manager --disable remi-php72
yum-config-manager --disable remi-php73
yum-config-manager --disable remi-php74

Once you have desired version enabled, run yum upgrade

yum upgrade

Or only for PHP, run

yum upgrade php*

December 11, 2019

CentOS 7 Grub 2
To regenerate grub config on CentOS 7, run
```
grub2-mkconfig -o /boot/grub2/grub.cfg
```
If you use UEFI, run
```
grub2-mkconfig -o /boot/efi/EFI/centos/grub.cfg
```
OVH CentOS 7 server grub rescue prompt

Back to grub
December 2, 2019
Disable PHP disable_functions on Cpanel Server
On a Cpanel Server using CentOS 7 + php-fpm, site phpinfo() shows few functions are set to disabled in disable_functions.

I checked server wide PHP configuration in WHM for the PHP version the site is using. There is no disable_functions specified.
```
WHM > Software > MultiPHP INI Editor > Editor Mode > PHP 7.3
```
This is because in Cpanel server running in PHP-FPM, you need to edit php-fpm pool config file at
```
vi /opt/cpanel/ea-php73/root/etc/php-fpm.d/DOMAIN_NAME.conf
```
Replace ea-php73 with whatever PHP version you selected for this web site.

Remove the line
```
php_admin_value[disable_functions] = exec,passthru,shell_exec,system
```
Restart php-fpm with
```
/scripts/restartsrv_apache_php_fpm
```
See Cpanel Server
October 5, 2019
dnf – Package manager for CentOS/RHEL 8
dnf is package manager for RHEL/CentOS 8. This is improved version of yum.

To search for a package, use
```
dnf search PACKAGE_NAME
```
To install a package, use
```
dnf install PACKAGE_NAME
```
September 28, 2019
CentOS 8
CentOS 8 is a short-lived Linux distribution based on Red Hat Enterprise Linux (RHEL). Due to a change in policy, CentOS 8 had an early end of life on December 31, 2021.

If you are using CentOS 8, you can easily migrate to other RHEL based distributions like Alma Linux, RockyLinux or Oracle Linux.

CentOS will now provide CentOS 8 Stream, which is a rolling release Linux distribution. CentOS 8 Stream will position itself in the middle of Fedora and RHEL. It won’t be a copy of RHEL, instead, it will be used as a testing ground for RHEL. Newer versions of the software get released on CentOS 8 Stream, once it becomes stable, it will be included in RHEL.
September 26, 2019
Run Apache from command line
To start Apache from command line with out using a systemd service file or init script, run
```
/usr/sbin/httpd -DFOREGROUND
```
To stop Apache, press CTRL+C.

You can keep it running by running it inside screen or tmux.

See Apache
September 25, 2019

Apache Increase FD limit

On CentOS 7 sevrer running apache, when try to install plugin in WordPress admin area, i get error

Installazione fallita: Il download non è andato a buon fine. cURL error 35: Process open FD table is full

This is due to Apache File Descriptor Limits.

To see current Limits, use following PHP script

FD Soft Limit: " . exec('ulimit -Sn');
echo "
FD Hard Limit: " . exec('ulimit -Hn');

To see system wide limits, use following commands

sysctl fs.file-nr
sysctl fs.file-max

Normally this will be high value. You need to increse limit for user running Apache. On CentOS 7, the username is “apache”. To increase limit for this user, edit

vi /etc/security/limits.conf

Add following lines

apache soft nofile 10240
apache hard nofile 900000

To verify, we need to login as user Apache, and verify limits, for this, lets enable SSH or bash terminal for user apache. By default no SSH login allowed for this user.

chsh --shell /bin/bash apache

Now change to user, verify the limits

su - apache
ulimit -Hn
ulimit -Sn

Exit back to root, disable shell for user apache with command.

chsh --shell /sbin/nologin apache

We need to edit service file for Apache. Default service file look like following.

[root@centos-s-1vcpu-1gb-blr1-01 ~]# cat /usr/lib/systemd/system/httpd.service
[Unit]
Description=The Apache HTTP Server
After=network.target remote-fs.target nss-lookup.target
Documentation=man:httpd(8)
Documentation=man:apachectl(8)

[Service]
Type=notify
EnvironmentFile=/etc/sysconfig/httpd
ExecStart=/usr/sbin/httpd $OPTIONS -DFOREGROUND
ExecReload=/usr/sbin/httpd $OPTIONS -k graceful
ExecStop=/bin/kill -WINCH ${MAINPID}
# We want systemd to give httpd some time to finish gracefully, but still want
# it to kill httpd after TimeoutStopSec if something went wrong during the
# graceful stop. Normally, Systemd sends SIGTERM signal right after the
# ExecStop, which would kill httpd. We are sending useless SIGCONT here to give
# httpd time to finish.
KillSignal=SIGCONT
PrivateTmp=true

[Install]
WantedBy=multi-user.target
[root@centos-s-1vcpu-1gb-blr1-01 ~]#

Find

[Service]

Add below

LimitNOFILE=65535
LimitNPROC=65535

Method 2

create file

mkdir -p /etc/systemd/system/httpd.service.d/
vi /etc/systemd/system/httpd.service.d/limits.conf

Add

[Service]
LimitNOFILE=65535
LimitNPROC=65535

Reload service file with

systemctl daemon-reload

Restart Apache

systemctl restart httpd

See Apache

September 25, 2019

Download RPM package from yum repository
To download RPM file from yum repo, you need to install yum-utils package.
```
yum install -y yum-utils
```
Now you can use command
```
yumdownloader --resolve --destdir=/path/ PACKAGE_NAME
```
Example
```
yumdownloader --resolve --destdir=/root/yum/ nginx
```
This will download and store all rpm files in /var/yum folder. –resolve will resolve dependency and download them. This will be helpful if you need to install a package on a system with no direct internet connection.

See yum
September 15, 2019

Zimbra Mail Server CentOS firewall settings

On CentOS 7 server with firewalld running, used following command to open ports used by Zimbra Mail Server.

firewall-cmd --zone=public --permanent --add-service=http
firewall-cmd --zone=public --permanent --add-service=https
firewall-cmd --zone=public --permanent --add-service=ssh
firewall-cmd --zone=public --permanent --add-port=110/tcp
firewall-cmd --zone=public --permanent --add-port=11211/tcp
firewall-cmd --zone=public --permanent --add-port=143/tcp
firewall-cmd --zone=public --permanent --add-port=25/tcp
firewall-cmd --zone=public --permanent --add-port=443/tcp
firewall-cmd --zone=public --permanent --add-port=465/tcp
firewall-cmd --zone=public --permanent --add-port=5222/tcp
firewall-cmd --zone=public --permanent --add-port=5269/tcp
firewall-cmd --zone=public --permanent --add-port=587/tcp
firewall-cmd --zone=public --permanent --add-port=7025/tcp
firewall-cmd --zone=public --permanent --add-port=7071/tcp
firewall-cmd --zone=public --permanent --add-port=7072/tcp
firewall-cmd --zone=public --permanent --add-port=7073/tcp
firewall-cmd --zone=public --permanent --add-port=7110/tcp
firewall-cmd --zone=public --permanent --add-port=7143/tcp
firewall-cmd --zone=public --permanent --add-port=7993/tcp
firewall-cmd --zone=public --permanent --add-port=7995/tcp
firewall-cmd --zone=public --permanent --add-port=8443/tcp
firewall-cmd --zone=public --permanent --add-port=993/tcp
firewall-cmd --zone=public --permanent --add-port=995/tcp
firewall-cmd --reload

See Zimbra, firewall-cmd

August 9, 2019

CentOS add IP Address
To add IP address on a Linux server, first find name of your network interface. This can be done with command
```
ip link
```
In most case, it can be enp3s0 or eth0, if you have more than one network card, this may be differnt, in such case, you need to identify which network interface you need to configure the the IP address .

Now create file
```
vi /etc/sysconfig/network-scripts/ifcfg-enp3s0:1
```
Here i used enp3s0 as network inferface name, replace it with whatever network interface name you use.

Add following content
```
DEVICE="enp3s0:1"
IPADDR=IP_ADDR_HERE
NETMASK=255.255.255.255
```
IP_ADDR_HERE = replace with the IP address you need to add.

enp3s0 = replace with actual network interface name.

Restart network service with command
```
systemctl restart network
```
If you need to add another IP, create file with name
```
INTERFACE_NAME:2
```
for example “enp3s0:2”, you need to use same alias name in DEVICE entry (first line) in the file.

Adding IP Range in CentOS 6
August 5, 2019
Install CentOS Web Panel (CWP)
CentOS Web Panel (CWP) is a free hosting control panel for CentOS servers.
- CWP not working after hostname SSL install
- Install PHP 7.2 mcrypt extension on CWP Server
To install CentOS Web Panel, run
```
yum -y install wget
cd /usr/local/src
wget http://centos-webpanel.com/cwp-latest
sh cwp-latest
```
CWP use same Ports as popular Cpanel control panel.

Admin Panel

CWP Admin Panel available on following URL.

You can login with system user “root” and its password.
```
http://server-ip:2030
http://server-ip:2086
https://server-ip:2031
https://server-ip:2087
```
User Panel
```
http://server-ip:2082/
https://server-ip:2083/
```
Webmail
```
http://server-ip:2095
https://server-ip:2096
```
On CWP server, you can find MySQL login details in following config files.
```
/root/.my.cnf
/usr/local/cwpsrv/htdocs/resources/admin/include/db_conn.php
/usr/local/cwpsrv/htdocs/resources/admin/include/postfix.php
```
Document Root

Web site files are stored in folder /home/USER/public_html

Stop/Start Services
```
systemctl start cwpsrv
systemctl start cwp-phpfpm
systemctl start httpd
```
php-fpm used by cwp control panel
```
systemctl stop cwpsrv-phpfpm
systemctl start cwpsrv-phpfpm
socket = /usr/local/cwp/php71/var/sockets/cwpsrv.sock
```
Service files are stored in /usr/lib/systemd/system/

Web Server

CWP support multiple web servers. For Apache, it is installed in folder
```
/usr/local/apache
```
Apache config file is /usr/local/apache/conf.d/vhosts.conf

CPW have its own apache package with name “cwp-httpd”, don’t use default httpd package provided by CentOS.

CWP server log can be found at
```
/var/log/cwp/webservers.log
```
See Hosting Control Panel
December 9, 2018