Linux How to use, Tutorials and scripts; Guides

How to install OpenSSL and mod ssl First need to install the openssl and mod ssl and then will generating the certificate to be used. Open a terminal prompt and issue the following command  [root@Centos7 conf.d]# yum install mod_ssl Loaded plugins: fastestmirror, langpacks Loading mirror speeds from cached hostfile  * base: mirror.nbrc.ac.in  * epel: kartolo.sby.datautama.net.id  * extras: mirror.nbrc.ac.in Resolving Dependencies --> Running transaction check ---> Package mod_ssl.x86_64 1:2.4.6-67.el7.centos.5 will be installed --> Finished Dependency Resolution Dependencies Resolved ========================================================================  Package                     Arch                 ...

How to install xrdp on CentOS 7 / RHEL 7 1. First Install Gnome on CentOS 7 2. Install and configure EPEL repository. [root@Centos7 system]# yum install epel-release Loaded plugins: fastestmirror, langpacks base                                                                                                           | 3.6 kB  00:00:00 extras                                                                                                         | 3...

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...

Getting the error while running the sudo -s to become root sudo: /usr/bin/sudo must be owned by uid 0 and have the setuid bit set 1.Login the server using root and change the permission of /usr/bin/sudo chmod 4755 /usr/bin/sudo 2. if you do not have root password then reboot the server on single usermode and run these commands. mount -o remount,rw /dev/mapper/lv_root / chown root:root /usr/bin/sudo chmod 4755 /usr/bin/sudo restart

root@HPUX:~# realm join --user=domainuser  windows.local  --install=/ -v  * Resolving: _ldap._tcp.windows.local  * Resolving: windows.local  * Performing LDAP DSE lookup on: 192.16.100.194  * Successfully discovered: windows.local Password for domainuser:  * Assuming packages are installed  * LANG=C /usr/sbin/adcli join --verbose --domain windows.local --domain-realm WINDOWS.LOCAL --domain-controller 192.16.100.194 --login-type user --login-user domainuser --stdin-password  * Using domain name: windows.local  * Calculated computer account name from fqdn: HPUX  * Using domain realm: windows.local  * Sending netlogon pings to domain controller: cldap://192.16.100.194  * Received NetLogon info from: GDCADC001.windows.local  * Wrote out krb5.conf snippet to /var/cache/realmd/adcli-krb5-OYG8o8/krb5.d/adcli-krb5-conf-QbSlJr  * Authenticated as user: domainuser@WINDOWS.LOCAL  ! Couldn't authenticat...

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 alread...

 EPEL Repository in RHEL/CentOS 7/6 To enable the EPEL repository on CentOS 7.x, RedHat 7.x, or Oracle Linux 7.0/7.1 This section describes how to download and install the EPEL repository. Download the EPEL repository: wget http://download.fedoraproject.org/pub/epel/7/x86_64/e/epel-release-7-2.noarch.rpm Install the EPEL repository: rpm -Uvh epel-release-7*.rpm Or you can use the commands [root@Centos7 ~]# yum install epel-release Loaded plugins: fastestmirror, langpacks epel/x86_64/metalink