https://www.linode.com/docs/tools-reference/linux-system-administration-basics/

https://www.inmotionhosting.com/support/website/server-usage/using-the-linux-top-command-in-batch-mode

https://serverfault.com/questions/190049/find-out-which-task-is-generating-a-lot-of-context-switches-on-linux

https://serverfault.com/questions/898064/centos-7-ldap-authentication-su-works-but-ssh-console-login-not-works

http://alvarom.com/2014/08/25/profiling-applications-on-linux/

https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/6/html/performance_tuning_guide/s-cpu-irq

https://www.linkedin.com/pulse/server-performance-tuning-interrupt-process-affinity-cpu-kumar

https://stackoverflow.com/questions/17565829/bash-kill-not-work

https://www.linuxcnf.com/2018/11/how-to-change-default-mta-in-cent-os-7.html

Networking

http://ask.xmodulo.com/configure-static-ip-address-centos7.html

Ubuntu 18 netplan iface config

https://wiki.debian.org/ru/NetworkConfiguration

disable IPv6 on CentOS

https://superuser.com/questions/710253/allow-non-root-process-to-bind-to-port-80-and-443

Тюнинг сетевого стека Linux для ленивых

- net commands replacement

https://dougvitale.wordpress.com/2011/12/21/deprecated-linux-networking-commands-and-their-replacements

- Turbo-boost, cpufreq, tuned etc

https://askubuntu.com/questions/800797/how-to-enable-turbo-boost

https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/6/html/power_management_guide/tuning_cpufreq_policy_and_speed

Problems with CPU frequency

https://wiki.mikejung.biz/CentOS_7#Activate_tuned_latency-performance_for_CentOS_7

https://www.certdepot.net/rhel7-get-started-cpu-governor/

https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/power_management_guide/tuned

https://unix.stackexchange.com/questions/164100/centos-7-cpupower-not-setting-the-cpus-to-maximum

https://www.servernoobs.com/avoiding-cpu-speed-scaling-in-modern-linux-distributions-running-cpu-at-full-speed-tips/

https://community.mellanox.com/s/article/how-to-set-cpu-scaling-governor-to-max-performance--scaling-governor-x

https://www.kernel.org/doc/html/v4.12/admin-guide/pm/intel_pstate.html

Selinux

https://www.cyberciti.biz/faq/redhat-install-semanage-selinux-command-rpm/

yum

Using yum variables

journald

https://unix.stackexchange.com/questions/139513/how-to-clear-journalctl