IP Forwarding issues with the MOI Appliance and MPMUI and MTCAC causing a connection issue with Docker

Products

• Mainframe Operational Intelligence

Issue/Introduction

After the initial installation of MOI 2.1 completes successfully, there has been one customer who encountered a problem where they cannot access the MOI appliance machine via the MPM UI or MTCAC.   A time out of the connection is the behavior encountered.  The cause of this issue was

identified as IP Forwarding being turned off.   Normally IP Forwarding is automatically turned on when the Docker software is installed on the appliance machine.   An IP Forwarding issue could occur if the customer has automation that 

turns off IP Forwarding independently of the Docker software install.   If this situation occurs, IP Forwarding needs to be turned on or Docker will not work.  This of course will result in MOI not working.  Note that IP Forwarding is a requirement of

the Docker software product.  

 

The Resolution Section of this Knowledge Document contains the Linux commands to check and turn IP Forwarding on for the MOI appliance machine. 

Environment

Release : 2.1

Component : MF OPERATIONAL INTELLIGENCE

Resolution

Linux IP Forwarding commands to check and turn IP forwarding on for the IPv4 protocol:

 

 

          Checking the status of IP Forwarding on a MOI Appliance:  ( zero is off,  one is on)

 

                                               >     sysctl net.ipv4.ip_forward

 

                                                               net.ipv4.ip_forward = 0

 

    

           Setting IP Forwarding on for a MOI Appliance: 

 

                                         

                                                >      sysctl -w net.ipv4.ip_forward=1