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systemctl status default.target   # to switch runlevels instantly systemctl isolate graphical.target systemctl isolate multi-user.target   ll /etc/systemd/system/default.target   #runlevel 3 ln -sf /lib/systemd/system/multi-user.target /etc/systemd/system/default.target   #runlevel 5 ln -sf /lib/systemd/system/graphical.target /etc/systemd/system/default.target  

egrep -i 'pubkey*' /etc/ssh/sshd_config sshd -T|egrep "pubkeyauthentication|pubkeyacceptedkeytypes"   Federal Information Processing Standards (FIPS) fips-mode-setup --disable fips-mode-setup --check fips-mode-setup --is-enabled Installation of FIPS modules is not completed. FIPS mode is disabled. update-crypto-policies --set LEGACY update-crypto-policies --show => LEGACY   reboot  

yum clean all yum update -y  

  vi /etc/php-fpm.d/derp.conf ;user = apache user = root   vi /lib/systemd/system/php-fpm.service  #ExecStart=/usr/sbin/php-fpm --nodaemonize ExecStart=/usr/sbin/php-fpm --nodaemonize -R   systemctl daemon-reload systemctl restart php-fpm  

#Run one-line remote command ssh test@host -p22 'hostname -f'   #Run Multi-Line Remote Command ssh test@host -p22 << EOF  hostname -f EOF       #Read Remote File and Run Remotely ssh test@host -p22 './test.sh'   #Read my file and run it remotely ssh test@host -p22 'bash -s' < test.sh  

# yum install pssh -y   # man pssh Connect to host1 and host2, and print "hello, world" from each:      pssh -i -H "host1 host2" echo "hello, world"   Print "hello, world" from each host specified in the file hosts.txt:      pssh -i -h hosts.txt echo "hello, world"   Run a command […]

# Failed to write core dump. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again   ulimit -c unlimited

mkdir /var/lib/rpm/out mv /var/lib/rpm/__db* /var/lib/rpm/out yum install ....