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linux:redhat

Redhat / Centos on server

Set Localization

localectl list-locales
localectl set-locale LANG=en_US.UTF-8

Rename ethX network

/etc/udev/rules.d/70-persistent-net.rules

Kernel limits

fs.aio-max-nr = 1048576
fs.file-max = 6815744
fs.inotify.max_user_watches=524288
fs.inotify.max_user_instances = 1024
kernel.sem = 250 320000 100 1280
kernel.shmmax = 4398046511104
kernel.shmmni = 4096
net.ipv4.ip_local_port_range = 9000 65500
net.core.rmem_default = 262144
net.core.rmem_max = 4194304
net.core.wmem_default = 262144
net.core.wmem_max = 1048576
net.ipv4.tcp_challenge_ack_limit = 1048576 // CVE-2016-5389

File limits

/etc/security/limits.d/90-nproc.conf

* soft nofile 102400
* hard nofile 102400
* soft nproc 10240
* hard nproc 10240

set_ulimit

/etc/pam.d/common-session
/etc/pam.d/common-session-noninteractive
/etc/pam.d/login

session required pam_limits.so

Systemd

LimitNOFILE=10000

Change IO Scheduler

/boot/grub/grub.conf

title Red Hat Enterprise Linux Server (2.6.18-8.el5)
	root (hd0,0) 
	kernel /vmlinuz-2.6.18-8.el5 ro root=/dev/sda2 elevator=deadline
	initrd /initrd-2.6.18-8.el5.img
linux/redhat.txt · Last modified: 2020/04/12 08:24 by Jan Forman