Problems with the Node Manager

Problems may occur if you are trying to restart the Administration Server through the Node Manager.

When you check to see whether the Node Manager is running, you could find that it is not running.

When I try to restart the Administration Server, I discover that the Node Manager is not running

For information about restarting the Administration Server through the Node Manager, see Use WLST Commands to Start the Administration Server.

To restart the Node Manager:

Use an SSH client of your choice to access the VM of the Administration Server.
If you do not have an SSH client on Windows, you can use PuTTY to access the VM by establishing an SSH tunnel.

If you are not automatically logged in as user opc, log in accordingly.
In the command window, change to user oracle.
```
sudo su - oracle
```
Change directories to where startNodeManager.sh exists.

If you are using Oracle Fusion Middleware 11.1.1.7, the location is:
```
/u01/app/oracle/middleware/wlserver_10.3/server/bin 
```
If you are using Oracle Fusion Middleware 12.2.1, the location is:
```
/u01/data/domains/<domain_name>/bin
```
For example:
```
cd /u01/data/domains/OurServi_domain/bin
```
Start the Node Manager:
```
nohup startNodeManager.sh
```
Check to see that the Node Manager is running:
```
ps -ef | grep NodeManager
```
You should receive messages showing that the Node Manager is running.
(Optional) If you have more than one host in your Oracle Java Cloud Service instance, you must restart the Node Manager on each host.
1. SSH to the second host:
```
ssh <hostname>
```
  For example:
```
ssh ourserviceinstance-wls-2
```
  You can find the hostname on the Oracle Java Cloud Service Instance page in the Oracle Java Cloud Service Console.
2. Change directories to where startNodeManager.sh exists.
  
  If you are using Oracle Fusion Middleware 11.1.1.7, the location is:
```
/u01/app/oracle/middleware/wlserver_10.3/server/bin 
```
  If you are using Oracle Fusion Middleware 12.2.1, the location is:
```
/u01/data/domains/<domain_name>/bin
```
  For example:
```
cd /u01/data/domains/OurServi_domain/bin
```
3. Start Node Manager:
```
nohup startNodeManager.sh
```
4. Check to see whether the Node Manager is running:
```
ps -ef | grep NodeManager
```
  You should receive messages showing that the Node Manager is running.
5. Exit the second host:
```
exit
```
Exit the oracle session:
```
exit
```
Exit out of the command window:
```
exit
```