Uninstalling Azul Zing System Tools

Table of Contents

Uninstalling the ZST from a ZST Node
Uninstalling the ZST from the Zing Server

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Note	The instructions below are applicable only if Azul Zing System Tools (ZST) is installed on the system. These do not apply if an Azul Zing build of OpenJDK (Zing) was installed using a tarball and being used without ZST.

Uninstalling ZST removes all the ZST elements, which includes the following:

Zing Memory
zing-ps

To uninstall ZST:

Login to your system as root.
Ensure there are no running processes using Zing Memory, type:
```
 zing-ps
```

Identify the installed Zing packages.

For RHEL or SLES:
```
 rpm -qa|grep zing
```

For Ubuntu:

 dpkg -l|grep zing

Sample response:

 zng-zst-5e.2.6.32-5.7.2.0.10.el6.x86_64
zing-jdk1.7.0-5.8.0.0-13.x86_64

Uninstall ZST. Run the appropriate remove or delete command.
- For RHEL:
```
 yum remove zing-zst-<version>
```
- For SLES:
```
 zypper remove zing-zst-<version>
```
- For Ubuntu:
```
 dpkg -P zing-zst-<version>
```
  This completes the ZST uninstallation.

Uninstalling the ZST from a ZST Node

Uninstalling ZST removes the ZST elements from the ZST node. To uninstall ZST:

Login to your system as root.
Shutdown all the Zing Java processes.
Ensure there are no running processes using Zing Memory, type:
```
 zing-ps
```

Run the shutdown script, zing-zst.shutdown, and confirm at the prompt. For example, including the optional -r option.

 /azul/zing_node/zst/scripts/zing-zst.shutdown -r

The system responds:

 Uninstalling ZST from the system...
Do you want to continue? (yes or no) y
Restoring core pattern
Removing zing-licensed
zing-licensed: INFO: Stopping...26109
zing-licensed: INFO: stop successful
Removing zing-memory
zing-httpd: INFO: Stopping...
zing-httpd: INFO: stop successful
zing-certd: INFO: Stopping...
zing-certd: INFO: stop successful
zing-memory: INFO: Stopping...
zing-memory: INFO: stop successful
Removing directories
Keeping /var/log/zing-httpd, directory is not empty
Removing ZST Kernel Object
Removing symlinks
Removing user and groups created for ZST
Removing /etc/zing
Uninstallation complete!

If you had enabled zing-core-pattern, the zing-zst.shutdown command restores your original core pattern. The zing-zst.shutdown command has the following options:

Command-Line Option Description

Command-Line Option	Description
`-h`	Displays help text.
`-r, --remove-etc-zing-folder`	Removes the `/etc/zing` folder.
`--batch-mode`	Uninstalls ZST without user interaction. Use it to avoid any confirmation questions during the uninstall procedure.

-h

Displays help text.

-r, --remove-etc-zing-folder

Removes the /etc/zing folder.

--batch-mode

Uninstalls ZST without user interaction. Use it to avoid any confirmation questions during the uninstall procedure.

Unmount the Zing server read-only directory from the local ZST node.
```
 # umount -l <zst_node_dir>
```
For example:
```
 # umount -l /azul/zing_node/zst
```
This command unmounts the local ZST node directory.
Optionally, remove the Zing log file directory. The /var/log/zing-httpd directory contains log files. If you want to remove those files as well, remove the directory manually.

Uninstalling the ZST from the Zing Server

Uninstalling ZST removes all the ZST elements, this includes the following:

Zing Memory
zing-ps

To uninstall ZST:

Uninstall ZST from all the ZST nodes. See the Uninstalling the ZST from a ZST Node section.
Login to your Zing server as root.
Ensure there are no running processes using Zing Memory, type:
```
 zing-ps
```
Uninstall ZST from the Zing server. Run the remove command.
```
 yum remove zing-zst-<version>
```

This completes the ZST uninstallation.