Category: CentOS – Page 2

yum commands

Posted on September 14, 2020 (September 14, 2020) by ServerOk

Install a software with yum

yum install PKG_NAME

1	yum install PKG_NAME

Uninstall a software

yum remove <softwarename>

1	yum remove <softwarename>

Example for installing php and GD

yum install php php-gd

1	yum install php php-gd

When you need to update all install software, run

yum update

1	yum update

List all available software

yum list available
yum list available "software-name"

1 2	yum list available yum list available "software-name"

List all installed software

yum list installed

1	yum list installed

See yum […]

EPEL – Extra Packages for Enterprise Linux

Posted on August 30, 2020 (August 30, 2020) by ServerOk

EPEL (Extra Packages for Enterprise Linux) provide additional software for CentOS and RHEL. You can find more information about EPEL at http://fedoraproject.org/wiki/EPEL On CentOS 7/8, you can enable EPEP repo with command

yum instal epel-release

1	yum instal epel-release

Or just download rpm package from the site and install. RHEL/CentOS 6:

yum install https://dl.fedoraproject.org/pub/epel/epel-release-latest-6.noarch.rpm

1	yum install https://dl.fedoraproject.org/pub/epel/epel-release-latest-6.noarch.rpm

RHEL/CentOS 7:

yum install https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm

1	yum install https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm

RHEL/CentOS 8:

yum install https://dl.fedoraproject.org/pub/epel/epel-release-latest-8.noarch.rpm

1	yum install https://dl.fedoraproject.org/pub/epel/epel-release-latest-8.noarch.rpm

See CentOS, yum […]

Install elasticsearch on CentOS 7

Posted on August 15, 2020 (March 10, 2021) by ServerOk

To install elasticsearch, first install java

yum -y install java-1.8.0-openjdk

1	yum -y install java-1.8.0-openjdk

Import key

rpm --import https://artifacts.elastic.co/GPG-KEY-elasticsearch

1	rpm --import https://artifacts.elastic.co/GPG-KEY-elasticsearch

Create file

vi /etc/yum.repos.d/elasticsearch.repo

1	vi /etc/yum.repos.d/elasticsearch.repo

Paste following

[elasticsearch]
name=Elasticsearch repository for 7.x packages
baseurl=https://artifacts.elastic.co/packages/7.x/yum
gpgcheck=1
gpgkey=https://artifacts.elastic.co/GPG-KEY-elasticsearch
enabled=0
autorefresh=1
type=rpm-md

[elasticsearch]

name=Elasticsearch repository for 7.x packages

baseurl=https://artifacts.elastic.co/packages/7.x/yum

gpgcheck=1

gpgkey=https://artifacts.elastic.co/GPG-KEY-elasticsearch

enabled=0

autorefresh=1

type=rpm-md

Install elasticsearch

yum install --enablerepo=elasticsearch elasticsearch

1	yum install --enablerepo=elasticsearch elasticsearch

Set elastic search to start on boot

systemctl enable elasticsearch

1	systemctl enable elasticsearch

To start/stop/status

systemctl stop elasticsearch.service
systemctl start elasticsearch.service
systemctl status elasticsearch.service

systemctl stop elasticsearch.service

systemctl start elasticsearch.service

systemctl status elasticsearch.service

To see logs

tail -f /var/log/elasticsearch/elasticsearch.log

1	tail -f /var/log/elasticsearch/elasticsearch.log

ElasticSearch runs on port 9200

[root@server ~]# netstat -lntp | grep java
tcp6       0      0 127.0.0.1:9200          :::*                    LISTEN      1289/java           
tcp6       0      0 ::1:9200                :::*                    LISTEN      1289/java           
tcp6       0      0 127.0.0.1:9300          :::*                    LISTEN      1289/java           
tcp6       0      0 ::1:9300                :::*                    LISTEN      1289/java           
[root@server ~]#

[root@server ~]# netstat -lntp | grep java

tcp6 0 0 127.0.0.1:9200 :::* LISTEN 1289/java

tcp6 0 0 ::1:9200 :::* LISTEN 1289/java

tcp6 0 0 127.0.0.1:9300 :::* LISTEN 1289/java

tcp6 0 0 ::1:9300 :::* LISTEN 1289/java

[root@server ~]#

If you get error starting elasticsearch, check Elasticsearch failed to start on CentOS 7 If […]

yum [Errno 5] [Errno 2] No such file or directory

Posted on August 8, 2020 by ServerOk

When running yum update on CentOS 7 server, i get following error

[root@server2 yum.repos.d]# yum update curl
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
Resolving Dependencies
--> Running transaction check
---> Package curl.x86_64 0:7.29.0-54.el7 will be updated
---> Package curl.x86_64 0:7.29.0-57.el7_8.1 will be an update
--> Processing Dependency: libcurl = 7.29.0-57.el7_8.1 for package: curl-7.29.0-57.el7_8.1.x86_64
--> Running transaction check
---> Package libcurl.x86_64 0:7.29.0-54.el7 will be updated
--> Processing Dependency: libcurl = 7.29.0-54.el7 for package: libcurl-devel-7.29.0-54.el7.x86_64
---> Package libcurl.x86_64 0:7.29.0-57.el7_8.1 will be an update
--> Running transaction check
---> Package libcurl-devel.x86_64 0:7.29.0-54.el7 will be updated
---> Package libcurl-devel.x86_64 0:7.29.0-57.el7_8.1 will be an update
--> Finished Dependency Resolution

Dependencies Resolved

============================================================================================================================================================================================================
 Package                                            Arch                                        Version                                                  Repository                                    Size
============================================================================================================================================================================================================
Updating:
 curl                                               x86_64                                      7.29.0-57.el7_8.1                                        updates                                      271 k
Updating for dependencies:
 libcurl                                            x86_64                                      7.29.0-57.el7_8.1                                        updates                                      223 k
 libcurl-devel                                      x86_64                                      7.29.0-57.el7_8.1                                        updates                                      303 k

Transaction Summary
============================================================================================================================================================================================================
Upgrade  1 Package (+2 Dependent packages)

Total download size: 796 k
Is this ok [y/d/N]: y
Downloading packages:
No Presto metadata available for updates


Error downloading packages:
  libcurl-7.29.0-57.el7_8.1.x86_64: [Errno 5] [Errno 2] No such file or directory
  libcurl-devel-7.29.0-57.el7_8.1.x86_64: [Errno 5] [Errno 2] No such file or directory
  curl-7.29.0-57.el7_8.1.x86_64: [Errno 5] [Errno 2] No such file or directory

[root@server2 yum.repos.d]#

[root@server2 yum.repos.d]# yum update curl

Loaded plugins: fastestmirror

Loading mirror speeds from cached hostfile

Resolving Dependencies

--> Running transaction check

---> Package curl.x86_64 0:7.29.0-54.el7 will be updated

---> Package curl.x86_64 0:7.29.0-57.el7_8.1 will be an update

--> Processing Dependency: libcurl = 7.29.0-57.el7_8.1 for package: curl-7.29.0-57.el7_8.1.x86_64

--> Running transaction check

---> Package libcurl.x86_64 0:7.29.0-54.el7 will be updated

--> Processing Dependency: libcurl = 7.29.0-54.el7 for package: libcurl-devel-7.29.0-54.el7.x86_64

---> Package libcurl.x86_64 0:7.29.0-57.el7_8.1 will be an update

--> Running transaction check

---> Package libcurl-devel.x86_64 0:7.29.0-54.el7 will be updated

---> Package libcurl-devel.x86_64 0:7.29.0-57.el7_8.1 will be an update

--> Finished Dependency Resolution

Dependencies Resolved

============================================================================================================================================================================================================

Package Arch Version Repository Size

Updating:

curl x86_64 7.29.0-57.el7_8.1 updates 271 k

Updating for dependencies:

libcurl x86_64 7.29.0-57.el7_8.1 updates 223 k

libcurl-devel x86_64 7.29.0-57.el7_8.1 updates 303 k

Transaction Summary

Upgrade 1 Package (+2 Dependent packages)

Total download size: 796 k

Is this ok [y/d/N]: y

Downloading packages:

No Presto metadata available for updates

Error downloading packages:

libcurl-7.29.0-57.el7_8.1.x86_64: [Errno 5] [Errno 2] No such file or directory

libcurl-devel-7.29.0-57.el7_8.1.x86_64: [Errno 5] [Errno 2] No such file or directory

curl-7.29.0-57.el7_8.1.x86_64: [Errno 5] [Errno 2] No such file or directory

[root@server2 yum.repos.d]#

Someone had tried to install differnt version of python on this server. That caused this problem. When i run urlgrabber-ext-down, i get error saying python missing.

[root@server2 ~]# /usr/libexec/urlgrabber-ext-down
-bash: /usr/libexec/urlgrabber-ext-down: /usr/bin/python: bad interpreter: No such file or directory
[root@server2 ~]#

[root@server2 ~]# /usr/libexec/urlgrabber-ext-down

-bash: /usr/libexec/urlgrabber-ext-down: /usr/bin/python: bad interpreter: No such file or directory

[root@server2 ~]#

Problem fixed by creating symlink

ln -s /usr/bin/python2.7 /usr/bin/python

1	ln -s /usr/bin/python2.7 /usr/bin/python

See yum […]

Install bind in CentOS 7

Posted on July 24, 2020 (July 24, 2020) by ServerOk

bind is a DNS server. To install bind on CentOS 7, run

yum install bind bind-utils -y

1	yum install bind bind-utils -y

Enable bind to start on boot

systemctl enable named

1	systemctl enable named

Start bind

systemctl start named

1	systemctl start named

You can see status with

systemctl status named

1	systemctl status named

Setup firewall You need to allow DNS ports UDP/TCP 53 in firewall. On CentOS 7, you can run

firewall-cmd --zone=public --permanent --add-service=dns
firewall-cmd --reload

1 2	firewall-cmd --zone=public --permanent --add-service=dns firewall-cmd --reload

Configure bind By default bind only listens […]

Install Python 3.8 on CentOS 6 from source

Posted on July 18, 2020 by ServerOk

To install Python 3.8 on CentOS, you need to install OpenSSL as the one installed by CentOS from yum is very old.

cd /usr/local/src
wget https://www.openssl.org/source/openssl-1.1.1g.tar.gz
tar xvf openssl-1.1.1g.tar.gz
cd openssl-1.1.1g
./config --prefix=/usr/serverok/openssl --openssldir=/usr/serverok/openssl no-ssl2
make
make install

cd /usr/local/src

wget https://www.openssl.org/source/openssl-1.1.1g.tar.gz

tar xvf openssl-1.1.1g.tar.gz

cd openssl-1.1.1g

./config --prefix=/usr/serverok/openssl --openssldir=/usr/serverok/openssl no-ssl2

make

make install

Now edit file

vi ~/.bash_profile

1	vi ~/.bash_profile

at end of the file, add

export PATH=/usr/serverok/openssl/bin:$PATH
export LD_LIBRARY_PATH=/usr/serverok/openssl/lib
export LC_ALL="en_US.UTF-8"
export LDFLAGS="-L/usr/serverok/openssl/lib -Wl,-rpath,/usr/serverok/openssl/lib"

export PATH=/usr/serverok/openssl/bin:$PATH

export LD_LIBRARY_PATH=/usr/serverok/openssl/lib

export LC_ALL="en_US.UTF-8"

export LDFLAGS="-L/usr/serverok/openssl/lib -Wl,-rpath,/usr/serverok/openssl/lib"

Make the settings active with command

source ~/.bash_profile

1	source ~/.bash_profile

Now we can install Python 3.8 with

cd /usr/local/src
wget https://www.python.org/ftp/python/3.8.4/Python-3.8.4.tar.xz
tar xvf Python-3.8.4.tar.xz
cd /usr/local/src/Python-3.8.4
make clean && make distclean
./configure --enable-optimizations  --with-openssl=/usr/serverok/openssl/
make altinstall

cd /usr/local/src

wget https://www.python.org/ftp/python/3.8.4/Python-3.8.4.tar.xz

tar xvf Python-3.8.4.tar.xz

cd /usr/local/src/Python-3.8.4

make clean && make distclean

./configure --enable-optimizations --with-openssl=/usr/serverok/openssl/

make altinstall

Now python 3.8 will be available […]

yum list all available packages in a repo

Posted on April 18, 2020 by ServerOk

To list all packages available on a specific repo, run

yum  --disablerepo="*" --enablerepo="REPO_NAME_HERE" list available
<pre>

You can get list of all available repos with command

<pre>
yum repolist

yum --disablerepo="*" --enablerepo="REPO_NAME_HERE" list available

<pre>

You can get list of all available repos with command

<pre>

yum repolist

Example:

yum  --disablerepo="*" --enablerepo="litespeed" list available

1	yum --disablerepo="*" --enablerepo="litespeed" list available

This command list all packages available in repo “litespeed” […]

Install PHP 7 on CentOS VestaCP

Posted on March 23, 2020 by ServerOk

To install PHP 7. you need to first enable epel and remi repo.

yum install -y epel-release
rpm -Uvh http://rpms.remirepo.net/enterprise/remi-release-7.rpm

1 2	yum install -y epel-release rpm -Uvh http://rpms.remirepo.net/enterprise/remi-release-7.rpm

Remove existing PHP

yum -y remove php

1	yum -y remove php

Install PHP 7.3

yum --enablerepo=remi-php73 install php73-php php73-php-mbstring php73-php-mysqlnd php73-php-gd php73-php-fpm php73-php-intl php73-php-cli php73-php-xml php73-php-opcache php73-php-pdo php73-php-gmp php73-php-process php73-php-pecl-imagick php73-php-devel

1	yum --enablerepo=remi-php73 install php73-php php73-php-mbstring php73-php-mysqlnd php73-php-gd php73-php-fpm php73-php-intl php73-php-cli php73-php-xml php73-php-opcache php73-php-pdo php73-php-gmp php73-php-process php73-php-pecl-imagick php73-php-devel

start php-fpm

service php-fpm stop
service php73-php-fpm start

1 2	service php-fpm stop service php73-php-fpm start

Set php 7.3 as default PHP for cli

rm /usr/bin/php
ln -s /usr/bin/php73 /usr/bin/php

1 2	rm /usr/bin/php ln -s /usr/bin/php73 /usr/bin/php

Restart apache

service httpd restart

1	service httpd restart

[…]

rpmdb DB_RUNRECOVERY: Fatal error, run database recovery

Posted on March 18, 2020 by ServerOk

When running yum update on a CentOS server, i get following error.

[root@ip-172-30-0-39 ~]# yum update
error: rpmdb: BDB0113 Thread/process 12797/46913889995840 failed: BDB1507 Thread died in Berkeley DB library
error: db5 error(-30973) from dbenv->failchk: BDB0087 DB_RUNRECOVERY: Fatal error, run database recovery
error: cannot open Packages index using db5 -  (-30973)
error: cannot open Packages database in /var/lib/rpm
CRITICAL:yum.main:

Error: rpmdb open failed
[root@ip-172-30-0-39 ~]#

[root@ip-172-30-0-39 ~]# yum update

error: rpmdb: BDB0113 Thread/process 12797/46913889995840 failed: BDB1507 Thread died in Berkeley DB library

error: db5 error(-30973) from dbenv->failchk: BDB0087 DB_RUNRECOVERY: Fatal error, run database recovery

error: cannot open Packages index using db5 - (-30973)

error: cannot open Packages database in /var/lib/rpm

CRITICAL:yum.main:

Error: rpmdb open failed

[root@ip-172-30-0-39 ~]#

To fix it, run

rm -f /var/lib/rpm/__db.00*

1	rm -f /var/lib/rpm/__db.00*

[…]

rpm verify packages

Posted on March 6, 2020 by ServerOk

To verify a package installed on system, you can use

rpm -V PKG_NAME

1	rpm -V PKG_NAME

Example

[root@hello-1 curl-curl-7_69_0]# rpm -V bind
S.5....T.  c /etc/named.conf
[root@hello-1 curl-curl-7_69_0]#

[root@hello-1 curl-curl-7_69_0]# rpm -V bind

S.5....T. c /etc/named.conf

[root@hello-1 curl-curl-7_69_0]#

Here bind package have /etc/named.conf file modified. To verify all packages on system, run

rpm -Va

rpm -Va

[…]