# ./launcher start app hangs
**URL:** https://meta.discourse.org/t/launcher-start-app-hangs/43234
**Category:** Support
**Created:** [April 26, 2016, 9:46am UTC](https://meta.discourse.org/t/launcher-start-app-hangs/43234 "2016-04-26T09:46:31Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@simeon](https://meta.discourse.org/u/simeon)
#### Post date: [April 26, 2016, 9:46am UTC](https://meta.discourse.org/t/launcher-start-app-hangs/43234/1 "2016-04-26T09:46:31Z")
Hi all,
this morning I switched form Mandrill to Mailgun. I followed the instructions in the [blog post](http://blog.discourse.org/2016/03/switching-your-discourse-from-mandrill-to-mailgun/) including Step 5. Spring Cleaning. All went fine and dandy until I tried to start the app with
```
./launcher start app
```
Problem: nothing happens. The shell hangs and my site is unreachable. If I `Ctrl + c` and run `docker ps` I see a `discourse/discourse:1.0.17` image running, see below.
```
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
a3fce921de40 discourse/discourse:1.0.17 "/bin/sh -c 'md5sum 5 minutes ago Up 5 minutes sick_goodall
```
Could the empty `PORTS` value be the problem? If so, how do I set it (I’m a Docker beginner)?
`docker info` output:
```plaintext
Containers: 10
Images: 17
Storage Driver: aufs
Root Dir: /var/lib/docker/aufs
Backing Filesystem: extfs
Dirs: 37
Dirperm1 Supported: false
Execution Driver: native-0.2
Logging Driver: json-file
Kernel Version: 3.13.0-52-generic
Operating System: Ubuntu 14.04.4 LTS
CPUs: 1
Total Memory: 994 MiB
ID: NAWC:SEKQ:IXUL:T7WC:IT5B:2FDJ:PPC6:LOGJ:W7GF:B43M:JC2K:2FZE
WARNING: No swap limit support
```
Output of `docker version`:
```plaintext
Client version: 1.7.0
Client API version: 1.19
Go version (client): go1.4.2
Git commit (client): 0baf609
OS/Arch (client): linux/amd64
Server version: 1.7.0
Server API version: 1.19
Go version (server): go1.4.2
Git commit (server): 0baf609
OS/Arch (server): linux/amd64
```
Any help is greatly appreciated as my site is currently down… :sadpanda:
---
### Author:  [@sam](https://meta.discourse.org/u/sam)
#### Post date: [April 26, 2016, 10:20am UTC](https://meta.discourse.org/t/launcher-start-app-hangs/43234/2 "2016-04-26T10:20:12Z")
command being `"/bin/sh -c 'md5sum` is a big concern … @mpalmer this really smells like it is this commit I am rolling it back for now:
[https://github.com/discourse/discourse\_docker/commit/21729b1bf284e487137c5c39957558834fc7bf9e](https://github.com/discourse/discourse_docker/commit/21729b1bf284e487137c5c39957558834fc7bf9e)
---
### Author:  [@sam](https://meta.discourse.org/u/sam)
#### Post date: [April 26, 2016, 10:21am UTC](https://meta.discourse.org/t/launcher-start-app-hangs/43234/3 "2016-04-26T10:21:34Z")
That change is reverted can you try rebuilding again?
---
### Author:  [@simeon](https://meta.discourse.org/u/simeon)
#### Post date: [April 26, 2016, 10:32am UTC](https://meta.discourse.org/t/launcher-start-app-hangs/43234/4 "2016-04-26T10:32:00Z")
Yes, that did it!
Thanks a million for the quick reply!
---
### Author:  [@mpalmer](https://meta.discourse.org/u/mpalmer)
#### Post date: [April 27, 2016, 6:21am UTC](https://meta.discourse.org/t/launcher-start-app-hangs/43234/8 "2016-04-27T06:21:36Z")
Just a followup to this, I’ve put together another PR that should fix this issue whilst still generating predicable MAC addresses.
---
### Author:  [@JammyDodger](https://meta.discourse.org/u/JammyDodger)
#### Post date: [June 8, 2024, 12:45pm UTC](https://meta.discourse.org/t/launcher-start-app-hangs/43234/9 "2024-06-08T12:45:47Z")
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