November 2015 Archives

Fri Nov 20 13:56:10 ICT 2015

After upgrading OpenJDK or Apache-tomcat

OpenJDK

Any update of OpenJDK overwrites the file containing the CACERTs accepted by Java (the keystore in Java lingo).

To have Java continue connecting to AIT services with the Insitute self-signed certificates, you must upgrade /usr/local/openjdk7/jre/lib/security/cacerts:

keytool -keystore /usr/local/openjdk7/jre/lib/security/cacerts -importcert \
  -trustcacerts -file ~on/SSL/ca/ait-new.crt -alias "ait new bundle (RSA)" \
  -storepass changeit
keytool -keystore /usr/local/openjdk7/jre/lib/security/cacerts -importcert \
  -trustcacerts -file ~on/SSL/ca/ait-itserv.crt -alias "ait old bundle (IDE)" \
  -storepass changeit
Apache-tomcat

An upgrade of Apache-tomcat will reset the ownership of many directories in Apache-tomcat installation to www.

To keep Apache-tomcat running with the user tomcat you must change the wonership back:

sudo chown -R tomcat:tomcat /usr/local/apache=-tomcat-8.0

Posted by Olivier | Permanent link | File under: administration, freebsd

Thu Nov 5 17:51:37 ICT 2015

Run ntpq on IPv4 only

The ntp server at CSIM accepts requests on IPv4 only. If the client is running an IPv6 stack, ntpq will default using IPv6 and will not be able to connect to the server. You must force ntpq to use IPv4:
sudo ntpq -np4

Posted by Olivier | Permanent link | File under: administration, freebsd

Tue Nov 3 10:59:36 ICT 2015

How-to power-off CSIM servers from remote

There is a definite order of action to properly power-off CSIM system from a remote access.
  1. Remote connect to bazooka.cs.ait.ac.th using ssh, the following connections will have to be initiated from bazooka only;
  2. Choose a time for the shutdown; the time should be well enough in the future so you can complete all the following tasks before it expires, a good practice is 30 minutes.
    VMware ESXi servers may take a substential anount of time to shutdown, depending of the number of virtual machine running on the server. A god rule of thumb is to consider 2 minutes for each vitual machines, plus 2 minutes for the server itself.

    When choosing the time to shutdown, allow enough time for the shutdown to properly complete before the general shutdown of the main electric power, a good practice is 30 minutes.

    So if a general failure of the main power is planned for 11:00, you should plan the shutdown time at 10:30 and start working at 10:00. In the following examples, we use 10:30 for the shutdown time.

  3. Start the shutdown sequence on the router: ssh to the account vyatta on the router and enter the command:
    sudo /sbin/shutdown -h 10:30 &
    
    and disconnect from the router;
  4. Start the shutdown sequence on the fireall: ssh to the account admin on the firewall and enter the command:
    shutdown -h 10:30 &
    
    and disconnect from the firewall.
    For the router and the firewall, you can reconnect and issue a shutdown -c to cancel the shutdown sequence;
  5. Start the shutdown sequence on amanda: ssh to amanda and enter the command:
    sudo shutdown -p 10:30 &
    
    and disconnect from amanda.
    For amanda, you cannot cancel the shutdown sequence;
  6. Start the shutdown sequence on VMware ESXi servers; the following has to be repeated for each of the servers: ssh to the account root on the VMware ESXi server and enter the command:
    /vmfs/volumes/datastore1/shutdown 635 &
    
    and disconnect from the server.
    To shutdown a VMware ESXi server, you don't use the time of shutdown as a parameter, but instead you use the number of seconds remaining until the time of shutdown: if the wall clock is 10:19:25 and you want to shutdown at 10:30, that makes it 10 minutes and 35 seconds, that is, 635 seconds.
    For the ESXi server, you can reconnect and issue a ps -c | grep shutdown to find the process ID of the shell script and kill the script to cancel the shutdown sequence.
    Every virtual machine on the ESXi server will be gracefully shutdown provided that:
    • VMware tools are installed on the virtual machine;
    • The virtual machine is configured to do a guest shutdown (default is a plain power off) in vSphere client Configuration/Virtual Machine Startup-Shutdown.

      On that note, you can also configre the startup to Continue immediately if VMware Tools start.


Posted by Olivier | Permanent link | File under: administration, firewall, vmware, freebsd, router