Patching Notes .

If plymouth is NOT disabled during boot time, it may create issue working on the console, we need to disable it during patching window.

cat /proc/cmdline | grep -i plymouth :

to check if the plymouth is disabled or not. if no output then no if any output then YES. 

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

Before patching :

history    

systemctl status scsm     :   check the status of scsm .

systemctl status cloud-init     :  check the status of cloud init .

df  -h  /   : check the available space in /  . 

cd  /home/homedir  :   Go to the directory . 

*********************************************************

lsblk >> lsblk ; df  -hT>> df-ht  ;  free  -tm >> swap  ;  cat /etc/fstab >> etcfstab     #compulsary    


cat  /etc/mail/sendmail.cf   |  grep   DS  |  grep    -iv  "#"   >>  sendmail
uptrack   -uname   -a  >> uname       #oracle linux
uname   -a        >>   uname                # redhat  and suse                                   
hostname  >> hostname 
timedatectl   >> timedatectl 

****************************************************

clear  :  clear the screen 

cat  df-ht  swap  etcfstab  lsblk  sendmail   uname  hostname  timedatectl  :   view the content of all the 8 files and copy it and paste it in notepad outside the server . 

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

During the Patching : 

***********************

Oracle servers :  

uptrack-upgrade   -y  :  (Mar- Apr)
yum   update   --security    -y   : (sept- oct)

***********************

Redhat servers : 

yum   update   --security    -y   : (Mar- apr)
yum   update   --security    -y   : (sept- oct)

**********************

Suse Linux Servers : 

Apply  Bug  Fix update  -zypper  patch   -g  bugfix

Apply  Security  update  -zypper  patch   -g  security

***********************

Use this when server is not taking patches  : 

systemcti status salt-minion

systemctl restart salt-minion

systemctl status salt-minion

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>



After Patching : 

history

***********************************

Kdump enablement --on All Systems                          #optional

#yast2 kdump >>> Enable Kdump >> OK > Reboot

systemctl status kdump                ....(should be running)

cat /etc/sysconfig/kdump | grep KDUMP_IMMEDIATE_REBOOT (should be YES)

*********************************

systemctl status scsm

systemctl status cloud-init

cd /home/homedir
ll

*********************************

lsblk >> newlsblk  ;  df  -hT >> newdf-ht   ;  free-tm >> newswap   ;  cat /etc/fstab >> newetcfstab

cat  /etc/mail/sendmail.cf   |  grep   DS  |  grep    -iv  "#"   >>  newsendmail
uptrack   -uname   -a  >> newuname       #oracle linux
uname   -a        >>   newuname                # redhat  and suse                                   
hostname  >> newhostname 
timedatectl   >> newtimedatectl 

ll

clear

***************************************************

diff   df-ht   newdf-ht
or  
cat   df-ht  |  grep  -v  tmpfs   ;  cat   newdf-ht  | grep  -v  tmpfs             #compare the output




diff   swap    newswap

or 

cat  swap  |  grep  -i  swap  ;  cat   newswap  | grep   -i  swap          #compare the output

diff     sendmail  newsendmail

or

cat sendmail   ;  cat newsendmail                               #compare the output

diff  uname newuname                         

or

cat uname   ;  cat newuname                             #compare the output 

diff  timedatectl    newtimedatectl                      

or

cat timedatectl   ;  cat newtimedatectl                   #compare the output

diff  hostname   newhostname                         

or

cat hostname   ;  cat newhostname                 #optional 

diff etcfstab newetcfstab 

or

cat etcfstab  ;  cat newetcfstab                     # optional 

diff  lsblk newlsblk                         

or

cat lsblk   ;  cat newlsblk                    #optional

 

********************************************************

Enable sysstat at boot time, All systems                       #optional

systemctl enable sysstat.service

systemctl restart sysstat.service

systemctl status sysstat.service

********************************************************

cat /proc/cmdline | grep -i plymouth      # check if plymouth is disabled or not