Management of RPM packages for SLES

SLES live patching

• https://wiki.scn.sap.com/wiki/display/ATopics/One+more+essential+step+towards+zero+downtime%3A+SUSE+Linux+Enterprise+Live+Patching
• https://wiki.scn.sap.com/wiki/x/HDW7Gg

File system permissions in SLES

User administration in SLES 15 sp01

• user and user groups are defined with numbers in the SLES. instead of strings. Because systems deal with numbers better then string.
• Most of the user and user group activities based on this number assigned to them.
• contents of etc/passwd file

• contents of etc/shadow file

Total file types in SLES

Mounting a new disk in the linux machine

step 1: df -h  ( to check the present file system directories)
step 2: fdisk -l : to check the hidden file storage, which need to active.
step 3: fdisk /dev/XXXX
step 4: enter m (for more info)
step 5: sequence to be followed:
                   n:add new disk.
                   p: (choose with extended or primary)
                   1: partition number 1

Note: if need to be 1 or more partitions. Need to provide details here.
          if required with one partition use the default value.
step 6: w to write the changes.
step 7: mkfs.ext3 -b 4096 /dev/XXXX
           for writing the idone number.
step 8: vi /etc/fstab

 add the entry of /dev/XXXX

wq

step 9: mkdir -p /file directory name (eg: /usr/sap)

step 10: if step 8 is not performed then every time need to execute the cmd

               mount /dev/XXXX    /<eg, usr>

reference link:
https://www.youtube.com/watch?v=sH6r7bwWuUw

Standard File system in SLES 15

FHS 2nd layer                                                                                                                                   

                                                                                          

How to make chown operate on files and directories recursively

How to make chown operate on files and directories recursively

destination path>

chown -R [new-owner]:[new-group] [directory-name-or-path]

modification rights

destination path> chmod -R 777 filename

Host agent default stage

ps -ef | grep -i sap




root      88063      1  0 Aug13 ?        00:10:05 /usr/sap/hostctrl/exe/saphostexec pf=/usr/sap/hostctrl/exe/host_profile

sapadm    88069      1  0 Aug13 ?        01:00:13 /usr/sap/hostctrl/exe/sapstartsrv pf=/usr/sap/hostctrl/exe/host_profile -D

root      88257      1  0 Aug13 ?        02:05:46 /usr/sap/hostctrl/exe/saposcol -l -w60 pf=/usr/sap/hostctrl/exe/host_profile

root      94800  94635  0 13:15 pts/1    00:00:00 grep --color=auto -i sap

To check the linux OS version details @ terminal level

cat  /etc/*release