Linux Stuffs

Here we will install centos 6. Redhat installation will be similar to centos Below are few steps. Step1: Open VMplayer and configure necessary settings (CPU,RAM, Disk etc) Step2: Installation of OS. Run the VM Step3: Once installation completes reboot the VM Step4: After system comes up check the IP address. Currenlty there no IP address assigned. We will check the config. IP adress is 192.168.111.128 - This is dynamic IP which means in next reboot server may have different IP. Step5: Create a static IP address for the server. We should know the gateway IP of the server and add it in eth0 config. Gateway IP is 192.168.111.2 Step6: We will reboot and check if IP address is same IP address is same. Step7: Now you can use this IP to connect the virtual machine from putty (Host Machine) Step8: Thats All. Hope you liked this. Thanks

connect: Network is unreachable If you are getting below error, then probably you have not added gateway address or you have incorrect gateway in config file. [root@cluster ~]# ping google.com connect: Network is unreachable Before: [root@cluster ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth3 DEVICE=eth3 TYPE=Ethernet ONBOOT=yes NM_CONTROLLED=yes BOOTPROTO=static IPADDR=192.168.174.130 NETMASK=255.255.255.0 After: [root@cluster ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth3 DEVICE=eth3 TYPE=Ethernet ONBOOT=yes NM_CONTROLLED=yes BOOTPROTO=static IPADDR=192.168.174.130 NETMASK=255.255.255.0 GATEWAY=192.168.174.2 [root@cluster ~]# ifdown eth3 [root@cluster ~]# ifup eth3 Determining if ip address 192.168.174.130 is already in use for device eth3... [root@cluster ~]# ping google.com PING google.com (216.58.218.174) 56(84) bytes of data. 64 bytes from dfw06s46-in-f14.1e100.net (216.58.218.174): icmp_seq=1 ttl=128 time=261 ms 6

 Ansible script to stop iptables and disable during boot Step 1. [root@cluster playbooks]# pwd /root/playbooks [root@cluster playbooks]# cat hosts [webservers] 169.254.41.221 169.254.41.222 Step2. [root@cluster playbooks]# cat iptables.yml --- - name: stop ipatbles and disable   hosts: webservers   tasks:   - name: stop iptables     service: name=iptables state=stopped   - name: disbale on iptable on boot     service: name=iptables enabled=no Step3: [root@cluster playbooks]# ansible-playbook iptables.yml PLAY [stop ipatbles and disable] *********************************************** TASK [setup] ******************************************************************* ok: [169.254.41.222] ok: [169.254.41.221] ok: [localhost] TASK [stop iptables] *********************************************************** changed: [localhost] ok: [169.254.41.221] ok: [169.254.41.222] TASK [disbale on iptable on boot] ********************************************** ok: [169.254.41.222] changed: [localhost

Ansible script to install httpd package and enable httpd during boot. Step 1. [root@cluster playbooks]# pwd /root/playbooks [root@cluster playbooks]# cat hosts [webservers] 169.254.41.221 169.254.41.222 Step2. [root@cluster playbooks]# cat httpd.yml --- - name: Install httpd package and start the service   hosts: webservers   tasks:   - name: install httpd     yum: name=httpd update_cache=yes   - name: enable httpd on boot     service: name=httpd enabled=yes   - name: start the service     service: name=httpd state=started Step3. Run [root@cluster playbooks]# ansible-playbook httpd.yml Output: PLAY [Install httpd package and start the service] ***************************** TASK [setup] ******************************************************************* ok: [169.254.41.221] ok: [169.254.41.222] TASK [install httpd] *********************************************************** changed: [169.254.41.221] changed: [169.254.41.222] TASK [enable httpd on boot] ******************************