Let's download and run the container to start a Informix engine.

1. Pull container image
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   $ docker pull ibmcom/informix-innovator-c

2. Install informix containter
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   $ docker run -it --name iif_innovator_c --privileged -p 9088:9088 -p 9089:9089 -p 27017:27017 -p 27018:27018 -p 27883:27883 -e LICENSE=accept ibmcom/informix-innovator-c:latest

   IDS-12.10 dev:

3. Exit informix container
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   IDS-12.10 dev: exit

   >>> Stopping the listeners...
   >>>    Stopping the IBM Informix Database (dev) ...

4. Start informix container
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   $ docker start iif_innovator_c

   iif_innovator_c

5. List active containers
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   $ docker ps

   CONTAINER ID        IMAGE                                COMMAND                  CREATED             STATUS              PORTS                                                                                              NAMES
   64e4b4e9c09e        ibmcom/informix-innovator-c:latest   "/bin/bash informi..."   14 minutes ago      Up 23 seconds       0.0.0.0:9088-9089->9088-9089/tcp, 0.0.0.0:27017-27018->27017-27018/tcp, 0.0.0.0:27883->27883/tcp   iif_innovator_c

6. Attach informix container
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   $ docker attach 64e4b4e9c09e

   IDS-12.10 dev: ^C   
   >>> Stopping the listeners...
   >>>    Stopping the IBM Informix Database (dev) ...

7. Copy

   $ docker exec -it iif_innovator_c bash

   IDS-12.10 dev:

8. Run onstat to see instance is running.
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   IDS-12.10 dev: onstat

   IBM Informix Dynamic Server Version 12.10.FC9IE -- On-Line -- Up 00:01:31 -- 148084 Kbytes
   
   Userthreads
   address          flags   sessid   user     tty      wait             tout locks nreads   nwrites
   44c9e028         ---P--D 1        informix -        0                0    0     23       11
   44c9e900         ---P--F 0        informix -        0                0    0     0        7
   44c9f1d8         ---P--F 0        informix -        0                0    0     0        0
   44c9fab0         ---P--F 0        informix -        0                0    0     0        0
   ...

9. Run onstat -d to see instance storage.
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   IDS-12.10 dev: onstat -d

   IBM Informix Dynamic Server Version 12.10.FC9IE -- On-Line -- Up 00:06:54 -- 156276 Kbytes
   
   Dbspaces
   address          number   flags      fchunk   nchunks  pgsize   flags    owner    name
   44bb4028         1        0x1        1        1        2048     N  BA    informix rootdbs
    1 active, 2047 maximum
   
   Chunks
   address          chunk/dbs     offset     size       free       bpages     flags pathname
   44bb4268         1      1      0          150000     85031                 PO-BE- /home/informix/data/spaces/rootdbs.000
    1 active, 32766 maximum

Here we have an Informix instance ready to be configured