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Monitoring Tools: Anyone tool must know – Nagios/Zabbix/Opmanager/ BMC tools/Bash Scripts which is automated for monitoring complete server.
Setup Linux OS Virtual/on-premises Server as per the requirement from Dev team.
- Set repository and Install packages and update to its stable version without losing any data.
- Create, Delete and modify user and groups
- Must be comfortable with CLI, and perform a major task using CLI.
- Manage file system permissions for users and groups and apply system policy.
- Must be aware of all system configuration file and keep a backup of it.
- File sharing for Windows and Linux ( samba, NFS )
- Should be able to work remotely without GUI and understating of SSH.
- Must have good knowledge of shell scripts, without shell scripting you can’t be a good system admin.
- Keep a record of changes and able to solve the problem quickly.
Troubleshoot memory issues, compile rpm and init scripts
Setting up the server for Application Team – So another team will work on it like DB, HA, Web team.
Tip: Keep everything backup.
Known Issue for Linux System Admin:
Server Load Average is high
Memory Usage is High # top
Unable to Login to Server # ssh hostname/IP –vvv (check ssh in verbose)
Disk Space Full – # df -h
The network is dropped #check ping or cable disconnected
Manual check Commands:
#top (or) #htop
Tips: basic troubleshooting commands:
Install: sar package
To report on previously captured data – type:
# sar -u -f filename > file
View disk I/O and transfer rate stats:
# sar -b 1 10
View memory and swap space stats:
# sar -r 1 10
View swapping stats:
# sar -W 1 10
View network stats:
# sar -n DEV 3 10
View CPU stats:
# sar -P ALL 1 5
Collect disk load for that install sysstat #yum install sysstat
#iostat -d -x 5
H/W Check –
# lshw (or) # lshw –short -> Print information about your Linux system hardware
# lscpu (or) # cat /proc/cpuinfo -> View Linux CPU Information
# lsblk -> Collect Linux Block Device
System Uptime – $uptime (Shows when the system is started, update every 1, 5, 15 min intervals and which user are login.)
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