First of all, snapshot your VM ! If your Exchange server is a physical one, that’s baaaad.
Reboot your server, it’s always nice to execute maintenance on a « clean » server.
Download and install Framework 4.7.1 and Visual C++ Redis blablabla (https://www.microsoft.com/en-US/download/details.aspx?id=40784).
Download (https://www.microsoft.com/en-us/download/details.aspx?id=57069) and unpack CU21 where you want
After that a new reboot is good no ?
Open CMD window with root privilege and go to where you unpacked your CU21 install files. Launch these commands :
setup.exe /PrepareSchema /IAcceptExchangeServerLicenseTerms
As you can see, installation checks the prerequisites
setup.exe /PrepareAD /IAcceptExchangeServerLicenseTerms
setup.exe /PrepareDomain /IAcceptExchangeServerLicenseTerms
setup /m:upgrade /IacceptExchangeServerLicenseTerms
If like me you faced this problem due to one process running : mscorsvw.exe
Just wait a few seconds/minutes for the process to finish itself and then launch again
At the end restart again your server and everything should be OK.
Sometimes you need to use old system (/etc/init.d) to start programs but when you want to add a new one and try to start it :
Simply install « redhat-lsb-core » and that’s OK !
If you don’t know what is Ganglia > http://ganglia.info/
When I managed HPC I deployed new nodes via « kickstart » (RHEL servers). But when you change of manufacturer of servers, there can be some device name changes ! For example NICs name !! So pay attention to modify in your /etc/ganglia/gmond.conf the two lines where is specify the name of the NIC on which Ganglia is looking (mcast_if)
If you need to install MySQL for what ever, you will have to launch this script :
The first question is to choose a password but since it’s the first installation, you didn’t choose any ! If you installed mariadb you can « bypass » this step by pressing enter but if you installed mysql-server you have to check in the log file created by mysql-server where you can find a temporary password.
Something like that : cat /var/log/mysql.log
Sick of having your logs (/var/log/messages) flooded by useless messages :
Type this command :
echo 'if $programname == "systemd" and ($msg contains "Starting Session" or $msg contains "Started Session" or $msg contains "Created slice" or $msg contains "Starting user-" or $msg contains "Starting User Slice of" or $msg contains "Removed session" or $msg contains "Removed slice User Slice of" or $msg contains "Stopping User Slice of") then stop' >/etc/rsyslog.d/ignore-systemd-session-slice.conf
Then restart your rsyslog (systemctl restart rsyslog)