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Install and configure rsyslog Centralized logging server in CentOS

 Install and configure rsyslog Centralized logging server in CentOS 6.5 In this tutorial we will learn, how to install and configure rsyslog 7.6 version on RHEL 6.5/CentOS 6.5 .The scenario is, install and setup rsyslog Centralized Logging Server in RHEL/CentOS 6.5. All the logs from client servers will be sent to Centralized logging server i.e rsyslog server. Check Pre-installed rsyslog package Step 1: First of all check the rsyslog package is installed in your system.Generally by-default we get rsyslog version 5.x , after minimal installation of CentOS 6.x / RHEL 6.x We will install the latest rsyslog package. At the time of writing this post, rsyslog stable version 7.6 was available. You can find the latest package information from rsyslog official website Note: By default, RHEL 6.x and CentOS 6.x has rsyslog version 5.x. So here we will update the rsyslog with new version. You can get the rsyslog version information, by using below given two commands rpm -qa|grep rsyslog
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How to fix postfix/smtp Network is unreachable error

While configuration postfix authentication getting the error status=deferred (delivery temporarily suspended: connect to smtp.office365.com[2603:1026:3:ca::2]:587: Network is unreachable) its because of you were not using IPv6/ wrong settings for ipv6. You can either use IPv4, or correct your IPv6 settings. [root@mailserver postfix]# netstat -nutlap | grep 25 tcp        0      0 0.0.0.0:25              0.0.0.0:*               LISTEN      3956/master tcp        0      0 127.0.0.1:38442         127.0.0.1:3306          ESTABLISHED 2596/httpd [root@mailserver postfix]# vi /etc/postfix/main.cf [root@mailserver postfix]# systemctl restart postfix [root@mailserver postfix]# netstat -nutlap | grep 25 tcp        0      0 0.0.0.0:25              0.0.0.0:*               LISTEN      4079/master tcp        0      0 127.0.0.1:38442         127.0.0.1:3306          ESTABLISHED 2596/httpd tcp6       0      0 :::25                   :::*                    LISTEN      407
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Could not join realm: Necessary packages are not installed: sssd-tools sssd libnss-sss libpam-sss adcli

Couldn't join realm: Necessary packages are not installed: sssd-tools sssd libnss-sss libpam-sss adcli root@HPUX:~# realm join --user=domainuser@windows.local  windows.local -v  * Resolving: _ldap._tcp.windows.local  * Resolving: windows.local  * Performing LDAP DSE lookup on: 192.168.20.24  * Successfully discovered: windows.local Password for domainuser@windows.local:  * Unconditionally checking packages  * Resolving required packages  ! Necessary packages are not installed: sssd-tools sssd libnss-sss libpam-sss adcli realm: Couldn't join realm: Necessary packages are not installed: root@HPUX:~# apt-get install sssd-tools sssd libnss-sss libpam-sss adcli Reading package lists... Done Building dependency tree Reading state information... Done adcli is already the newest version (0.8.1-1). libnss-sss is already the newest version (1.13.4-1ubuntu1.7). libpam-sss is already the newest version (1.13.4-1ubuntu1.7). sssd is already the newest version (1.13.4-1u
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