Importance of linux system fundamental in technical documentation reading
1 like530 views
The document discusses the importance of understanding Linux systems for effectively reading technical documentation. It provides essential command line configurations, kernel module management, and settings for virtualization in Red Hat Enterprise Linux. Key commands for system tuning, file management, and the use of systemd scripts are also highlighted.
![Using systemd
Using echo command to change /sys settings will be lost after reboot!
Solutions:
• Put the commands into /etc/rc.local
OR
• Create a systemd script :
vi /etc/systemd/system/set_transparent_hugepages.service
[Unit]
Description=Disable transparent hugepages
After=multi-user.target
[Service]
ExecStart=/usr/bin/bash -c 'echo never > /sys/kernel/mm/transparent_hugepage/enabled'
[Install]
WantedBy=graphical.target
systemctl enable set_transparent_hugepages.service](https://image.slidesharecdn.com/importanceoflinuxsystemfundamentalintechnicaldocumentation-160823132253/85/Importance-of-linux-system-fundamental-in-technical-documentation-reading-9-320.jpg)
Importance of linux system fundamental in technical documentation reading
- 1. Importance of Linux System Fundamental In Technical Documentation Reading by netman<netman@study-area.org> August 2016
- 3. The Basic Requirement English reading Google searching+
- 4. Command line & Quoting Improper line ending perf kvm --host --guest --guestmodules=guest-modules report -i perf.data.kvm --force > analyze Should be: perf kvm --host --guest --guestmodules=guest-modules report -i perf.data.kvm --force > analyze Or:
- 5. Configuration of sysctl echo “net.ipv4.conf.all.arp_filter=1” >> /etc/sysctl.conf sysctl -p It means:
- 6. Kernel module management echo “options vhost_net experimental_zcopytx=1” > /etc/modprode.d/vhost_net.conf modprobe –r vhost_net modprobe vhost_net Actually you should do:
- 7. Configuration file path You have to know about: • The guest xml path: /etc/libvirt/qemu/guest_name.xml OR • The command to edit guest xml: virsh edit guest_name Substitute to a number!
- 8. Try & Error virsh memtune virtual_machine --hard-limit size It is wrong!! It should be:
- 9. Using systemd Using echo command to change /sys settings will be lost after reboot! Solutions: • Put the commands into /etc/rc.local OR • Create a systemd script : vi /etc/systemd/system/set_transparent_hugepages.service [Unit] Description=Disable transparent hugepages After=multi-user.target [Service] ExecStart=/usr/bin/bash -c 'echo never > /sys/kernel/mm/transparent_hugepage/enabled' [Install] WantedBy=graphical.target systemctl enable set_transparent_hugepages.service
- 10. Vi/Vim Editing It requires you using vi or vim!
- 11. Grub configuration It’s talking about modifying kernel options in GRUB: vi /etc/default/grub GRUB_CMDLINE_LINUX=“… default_hugepagesz=1G hugepagesz=1G hugepages=4 hugepagesz=2M hugepages=1024" grub2-mkconfig -o /boot/grub2/grub.cfg
- 12. Using yum yum list '*numa*' yum install numactl Command not found!! You must install it first:
- 13. Using locate It doesn’t show you the full path! You have to find it out:
- 14. Many more…
- 15. Thank you!