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Day 18.md

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DAY 18

NFS

Server

  • for ubuntu ( sudo apt-get install kernel-nfs-server)
  • for rhel ( sudo yum install nfs-utils )
  • Create a directory to use as nfs ( mkdir /shareable-directory)
  • vi /etc/exports directory-path ip-to-allow-to-connect(rw or ro,no_root_squash)
  • exportfs -r # it makes all files shareable on server, basically reloads the exports file
  • chmod 757 directory-path
  • showmount -e ip-of-server ( All traffic should be open )

Client

  • showmount -e server-ip
  • mount server-ip:directory-path directory-path-to-mount-on
  • entry in fstab 
    source-ip:directory-path where-to-mount nfs _netdev 0 0

Ansible

  • Install Ansible by
yum install ansible.noarch -y

or

pip install ansible
  • In background , ansible uses SSH protocol (open ssh server) to connect and work over each system thus every system must have ssh installed and configured
  • In hosts file of ansible that is /etc/ansible/hosts we can use normal public IP address or public DNS to connect with hosts
  • To work from a user while not using the default configuring files,
    1. Copy the ansible configuration file /etc/ansible/ansible.conf to users home directory
    2. Create a hosts file to enter the entry of targets ip-address
  • To disable the ssh host key checkup , open the config file and set host_key_checking = False
  • To create a file using ansible
ansible localhost -m file -a "path=directory-path state=directory mode=0755"
  • to learn about any ansible module
ansible-doc module-name
  • to see what happens in background while using ansible use
ansible adhoc-command -vvv
  • ifconfig br0: ifnet is the private ip lancard of ethernet is eno1 lancard of wifi is wl bridgecard is br0 in exam many things are configured on br0
    • Fixing an IP is termed as static ip

Setting up static IP

  • ping ip-address -> check if ip is working properly
  • ping server-name (if not possible then set in resolv.conf )
  • set ip
cd /etc/sysconfig/network-scripts/
  • name of file in this directory should be ifcfg-lan_card_name example ifcfg-eth0
  • vi ifcfg-etho
  • change BOOTPROTO="static"
  • NAME = "lan-card-name"
  • ONBOOT = "yes"
  • in last line
IPADDR= 192.168.10.43
DNS=192.168.10.254 (server will be given,name-server/domain-name-server)
NETMASK= 255.255.255.0 - > single public ip (can be taken from ifconfig)
GATEWAY= 192.168.10.1     (ip to communicates with outside world)
  • route -n # shows the values of kernel ip routing table
  • 0.0.0.0 means anywhere
  • after configuration, reboot which must show the set ip
  • resolv.conf - > gives ip from name
  • after setting static ip
  • open /etc/resolv.conf
  • nameserver ip-address-of-eth0

Ansible

  • For Ansible, Linux machine is required

Inventory:-

  • Static
  • Dynamic

Localhost user is used through ansible and ping command is used; -m= module include which is ping here

 ansible localhost -m ping

 O/P:-
 localhost | SUCCESS => {
    "changed": false,
    "ping": "pong"
}

ansible all -m ping -u ec2-user

File module; -a= for argument pass

ansible localhost -m file -a "path=/root/naman state=directory mode=755"

shell module = For running the shell commands through ansible; -vvv= shows the working of backend in terminal

ansible localhost -m shell -a "date" -vvv