# Setting up Redundancy between two Docker instances

**URL:** <https://forum.inductiveautomation.com/t/setting-up-redundancy-between-two-docker-instances/116846>\
**Category:** Ignition\
**Tags:** docker\
**Created:** [August 20, 2026, 2:11pm UTC](https://forum.inductiveautomation.com/t/setting-up-redundancy-between-two-docker-instances/116846 "2026-08-20T14:11:41Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![Frank\_Pockele](https://avatars.discourse-cdn.com/v4/letter/f/7bcc69/32.png) [@Frank\_Pockele](https://forum.inductiveautomation.com/u/Frank_Pockele)\
**Post date:** [August 20, 2026, 2:11pm UTC](https://forum.inductiveautomation.com/t/setting-up-redundancy-between-two-docker-instances/116846/1 "2026-08-20T14:11:41Z")

</div>

I've setup two docker instances with the following docker-compose:

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/a/7/a7efcd96fabeb44826b22c4d76407d63934a75bd.png)

Both gateways work, but configuring the redundancy between the two fails  
I've set frontend01 as master and frontend02 as backup with master node address 192.168.100.2  
Approved the connection on the backup

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/e/a/ea6f35cf5a549efc29840a7549512b3f294a6b33.png)

But don't see a Incoming connection on the master

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/3/5/353f46b2ecc2ca6a689496d6852b0a7e21df1902.png)

In the logging on the backup i do find this

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/b/d/bd4e5c3b4099b950f0f1b55949a48d81eed8e646.png)

Can some one help me?

---

<div class="post-metadata">

**Author:** ![allen.miller1](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/allen.miller1/32/85567_2.png) [@allen.miller1](https://forum.inductiveautomation.com/u/allen.miller1)\
**Post date:** [August 20, 2026, 2:57pm UTC](https://forum.inductiveautomation.com/t/setting-up-redundancy-between-two-docker-instances/116846/2 "2026-08-20T14:57:25Z")

</div>

I'm wondering if there are issues like address conflicts or proxies on that bridge network `192.168.100.0/24`.

I am able to connect the two gateways without issue using this environment. Does this work for you?

```yaml
services:
  frontend01:
    image: inductiveautomation/ignition:8.3.8
    hostname: frontend01
    ports:
      - 9988:8088
    environment:
      - TZ=America/Los_Angeles
      - ACCEPT_IGNITION_EULA=Y
      - GATEWAY_ADMIN_USERNAME=admin
      - GATEWAY_ADMIN_PASSWORD=password
      - IGNITION_EDITION=standard
      - DISABLE_QUICKSTART=true
    command: >
      -n frontend01
      -m 2048

  frontend02:
    image: inductiveautomation/ignition:8.3.8
    hostname: frontend02
    ports:
      - 9989:8088
    environment:
      - TZ=America/Los_Angeles
      - ACCEPT_IGNITION_EULA=Y
      - GATEWAY_ADMIN_USERNAME=admin
      - GATEWAY_ADMIN_PASSWORD=password
      - IGNITION_EDITION=standard
      - DISABLE_QUICKSTART=true
      - GATEWAY_NETWORK_0_HOST=frontend01
      - GATEWAY_NETWORK_0_PORT=8060
    command: >
      -n frontend02
      -m 2048

```

Edit to add: I removed these env vars on the master. I realize they don't make sense for redundancy - once redundancy is configured, `frontend02` will use the name `frontend01-backup` for GAN

- GATEWAY\_NETWORK\_SECURITYPOLICY=SpecifiedList
- GATEWAY\_NETWORK\_WHITELIST=frontend02

---

<div class="post-metadata">

**Author:** ![Frank\_Pockele](https://avatars.discourse-cdn.com/v4/letter/f/7bcc69/32.png) [@Frank\_Pockele](https://forum.inductiveautomation.com/u/Frank_Pockele)\
**Post date:** [August 21, 2026, 9:42am UTC](https://forum.inductiveautomation.com/t/setting-up-redundancy-between-two-docker-instances/116846/3 "2026-08-21T09:42:22Z")

</div>

Yes with this configuration i'm able to configure the Redundancy.  
This gives me a good starting point