Upgrading JDK

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Upgrading JDK

 - This article is a Work in Progress, and may be unfinished or missing sections.

Manually upgrading Java JDK with ZCS

For security and performance reasons, it would be a good idea for customers running older versions of ZCS to manually upgrade their Java JDK version. The following steps provide the instructions on doing this - it is a low-risk activity with an easy method to rollback to the current JDK release - both versions remain on the server.

0. Download the correct version of the JDK for your version of Zimbra ZCS:

• ZCS8: Java SE Development Kit (JDK) 7
• ZCS7: Java SE Development Kit (JDK) 1.6
• ZCS6: Java SE Development Kit (JDK) 1.6
• ZCS5: Java SE Development Kit (JDK) 1.6

Manual Install Instructions (using JDK 1.6 as an example, for ZCS7)

1. Download jdk1.6 (latest)

Java SE Development Kit: http://www.oracle.com/technetwork/java/javase/downloads/java-archive-downloads-javase6-419409.html

2. Download appropriate version

Use .bin version (not rpm.bin), x64 or x86 as appropriate for your OS install.

3. Move download to mailstore(s) into /var/tmp, open binary

# chmod 755 /var/tmp/jdk-6u45-linux-x64.bin
# ./jdk-6u45-linux-x64.bin
Unpacking...
Checksumming...
Extracting...
UnZipSFX 5.50 of 17 February 2002, by Info-ZIP (Zip-Bugs@lists.wku.edu).
   creating: jdk1.6.0_45/
   creating: jdk1.6.0_45/db/
   creating: jdk1.6.0_45/db/bin/
  inflating: jdk1.6.0_45/db/bin/ij  
<snip>
Creating jdk1.6.0_45/jre/lib/javaws.jar
Creating jdk1.6.0_45/jre/lib/deploy.jar
Done.

4. Move to /opt/zimbra

(as root)
# mv -i jdk1.6.0_45 /opt/zimbra/

5. Copy cacerts file from existing Java setup

# cp /opt/zimbra/java/jre/lib/security/cacerts /opt/zimbra/jdk1.6.0_45/jre/lib/security #replace the existing file
# chown zimbra:zimbra /opt/zimbra/jdk1.6.0_45/jre/lib/security/cacerts

6. Remove and replace the symlink

# cd /opt/zimbra
# rm java
# ln -s /opt/zimbra/jdk1.6.0_45 java

7. Restart the java processes

# su - zimbra
$ zmmailboxdctl restart
$ zmconfigdctl restart

8. Rollback Plan

Leave the old java version intact just in case. Rolling back is just a matter of altering the symlink for /opt/zimbra/java, and restarting the processes again.

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