Upgrade the Apache Agent

To upgrade the agent:

Kill the proxy process.

If you do not know the PID of the proxy process you can get it by running this command:
```
ps -aux | grep "proxy"
```
Then kill the process as follows:
```
kill <PID>
```
Shut down the web server.
Move/rename the agent install directory, /opt/appdynamics-sdk-native, to make a backup.
Download the new version of the agent and extract it into /opt/appdynamics-sdk-native.
Change directory to the agent install directory:
```
cd <agent_install_directory>
```
Run the installer:
```
./install.sh
```
It is not necessary to change the configuration when you use the same directory location as the old agent installation.
Launch the proxy process:
To launch the proxy manually, run runSDKProxy.sh using the user ID of the Apache worker threads.
```
nohup <agent_install_directory>/runSDKProxy.sh >>/dev/null 2><agent_install_dir>/logs/proxy.out &                        
```
It is recommended that you create a Unix System Service that automatically starts the proxy at system startup.
Note: The Proxy expects the appropriate (64- vs. 32-bit) libstdc+6 library location. If you are installing the Apache Agent on a 64-bit OS that supports running a 32-bit Apache HTTP Server, make sure that the downloaded Apache Agent matches (i.e., is 32-bit), and that the libstdc+6 library is 32-bit as well. If you have both 64-bit and 32-bit versions of that library, make sure you are pointing to the correct version using the command export LD_PRELOAD=<path to 32bit library> before starting runSDKProxy.
Restart the web server.