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Add suggestion for low memory VMs #1358

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Merged
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Aug 2, 2015
Merged

Add suggestion for low memory VMs #1358

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07cb639
Add suggestion for low memory VMs
Jul 30, 2015
d66b466
Little correction
Jul 30, 2015
003ab07
Adapt to other shell example script
Jul 30, 2015
3a0a873
Move small memory instructions to advanced installation
Jul 31, 2015
fa36d38
Small fix
Jul 31, 2015
9fb7c20
Move small memory instructions to advanced installation - installatio…
Jul 31, 2015
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22 changes: 22 additions & 0 deletions docs/advanced-installation.md
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Expand Up @@ -57,3 +57,25 @@ If you are using the vagrant installation, you can use the following command to
$ cat ~/.ssh/id_rsa.pub | make vagrant-acl-add

That's it!

## VMs with less than 1GB of memory

Having less than 1GB of system memory available for dokku and its containers, for example Digital Ocean's small 512MB machines, might result in unexpected errors, such as **! [remote rejected] master -> master (pre-receive hook declined)** during installation of NPM dependencies (https://github.com/npm/npm/issues/3867).

To work around this issue, it might suffice to augment the linux swap file size to a maximum of twice the physical memory size.

To resize the swap file of a 512MB machine to 1GB, follow these steps while in SSH within your machine:

```shell
cd /var
touch swap.img
chmod 600 swap.img

dd if=/dev/zero of=/var/swap.img bs=1024k count=1000
mkswap /var/swap.img
swapon /var/swap.img
free

echo "/var/swap.img none swap sw 0 0" >> /etc/fstab
```
Reference: https://www.digitalocean.com/community/tutorials/how-to-configure-virtual-memory-swap-file-on-a-vps
1 change: 1 addition & 0 deletions docs/installation.md
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Expand Up @@ -3,6 +3,7 @@
## Requirements

- A fresh VM running Ubuntu `14.04 x64`
- At least `1GB` of system memory ([workaround for 512MB machines](http://progrium.viewdocs.io/dokku/advanced-installation))

Ubuntu 14.04 x64 x64. Ideally have a domain ready to point to your host. It's designed for and is probably best to use a fresh VM. The bootstrapper will install everything it needs.

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