Set up passwordless SSH access to the Failover Manager servers for non-root users

For Linux, perform the following procedure on both Active and Standby machines for non root users:

Select or create a non-root group to be used by Failover Manager for passwordless communication (for example, smartsgrp). Type:
```
#groupadd smartsgrp
```
Select or create a non-root account to be used by Failover Manager for passwordless communication (for example, smartsusr ). Type:
```
#adduser smartsusr -g smartsgrp
```
Verify that passwordless SSH access is set up for the Failover Manager. To do so, initiate an SSH connection from:
Failover manager to all of the hosts used in failover.conf file
To the failover manager host itself
Between all of the Active and Standby Hosts used in the failover.conf file

Using the command:
```
# ssh smartsusr@<host_name>
```
Where <host_name> is the DNS name of the machine on which the component is running.

Note:
On initial connection you will be prompted to add a known host and asked o continue, type 'yes'. The authenticity of host 'apollo (10.241.215.34)' can't be established. RSA key fingerprint is e5:a9:32:3f:0e:bf:53:87:97:ce:8e:c6:4c:29:34:93. Are you sure you want to continue connecting (yes/no)?
Later when you are configuring the Failover Manager, edit the failover.conf file as follows. This ensures that the root process executes commands for non-root user. Also, it specifies the location of the security key.
```
TransferCmd="/usr/bin/scp -i /home/smartsusr/.ssh/id_rsa"; 
RemoteLogin="/usr/bin/ssh -i /home/smartsusr/.ssh/id_rsa";
```

Change the ownership of the directory <BASEDIR>/smarts/local to smartsusr and smartsgrp on both machines Active and Standby, so that users in the group can alter local smarts folder. Type:

#usermod -G smartsgrp smartsusr
#chown -R smartsusr:smartsgrp <install_path>/smarts/local
#chmod -R g+w <install_path>/smarts/local
#chmod 444 <install_path>/smarts/local/conf/*Connect.conf
#chmod 444 <install_path>/smarts/local/conf/imk.dat
#chmod 644 <install_path>/smarts/local/conf/runcmd_env.sh

Log in as smartsusr and set the permission for .ssh folder to 700 on both machines Active and Standby. Type:
```
 #chmod 700 /home/smartsusr/.ssh
```
Log in as smartsusr and set the permission for .ssh/authorized_keys to 600 on both machines Active and Standby. Type:
```
 #chmod 600 /home/smartsusr/.ssh/authorized_keys
```
Execute the ssh command manually from root to check that the ssh command works correctly:
```
 #ssh -i /home/smartsusr/.ssh/id_rsa -n -l smartsusr itops-qa-108 ls –lrt
```
Once the above step is successful, edit the BASEDIR/smarts/conf/failover/failover.conf file with the following content:

Comment the root user TransferCmd and RemoteLogin and enable it for non-root user as below:

TransferCmd = "/usr/bin/scp -p -i /home/smartsusr/.ssh/id_rsa"; 
RemoteLogin = "/usr/bin/ssh -i /home/smartsusr/.ssh/id_rsa";

Change the user as smartsusr.
Change the ownership to the smartsgp. Type:
```
#chown -R root:smartsgrp /var/smarts/
```
Change the permissions for sm_service. Type:
```
#chmod 770 /var/smarts/pipes/sm_service
```
To ensure that passwordless communication is working after a host reboot, modify the /etc/init.d/ic_serviced file on all hosts.
Edit /etc/init.d/ic-serviced.
Find the following line:
```
check_startup(){
```

Add the following code (in bold):

check_startup(){
    COUNT=1
    while true
    do
        sleep 1
        isRunning
        if [ $? -eq 1 ]; then
            [ "$OS" = "Linux" ] && touch $LOCKFILE
            break
        fi
        COUNT=`expr ${COUNT} + 1`
        if [ ${COUNT} -gt 60 ];
        then
            echo "$SERVICED failed to start."
            exit 1
        fi
  done
sleep 5
  chown -R root:smartsgrp /var/smarts
 sleep 5
chown -R smartsusr:smartsgrp <BASEDIR>/smarts/local
  sleep 5
  chmod 770 /var/smarts/pipes/sm_service
  }

Save the file and exit.

Verify that the non-root setup is working properly. Log in as a non-root user and run the following remote command:

sm_service show
[smartsusr@wpl-019-072 bin]$ /usr/bin/ssh -i /home/smartsusr/.ssh/id_rsa -n -l smartsusr wpl-019-071.lss.emc.com 2>&1 /opt/InCharge/SAM/smarts/bin/sm_service show
 RUNNING ic-trapd-exploder
 RUNNING smarts-rabbitmq
 NOT RUNNING ic-broker
 NOT RUNNING ic-broker-test
 RUNNING smarts-elasticsearch
 RUNNING ic-sam-server-pres
 RUNNING smarts-tomcat
 RUNNING ic-broker-93
 NOT RUNNING ic-sam-server
 [smartsusr@wpl-019-071 ~]$ /usr/bin/ssh -i /home/smartsusr/.ssh/id_rsa -n -l smartsusr wpl-019-072.lss.emc.com 2>&1 /opt/InCharge/SAM/smarts/bin/sm_service show
 RUNNING smarts-rabbitmq
 RUNNING ic-trapd-exploder
 RUNNING ic-broker
 RUNNING smarts-elasticsearch
 RUNNING ic-sam-server-pres
 RUNNING smarts-tomcat
 RUNNING ic-broker-93