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make ec2 user configurable

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This commit is contained in:
Jake Buchholz 2019-06-03 21:19:59 -07:00 committed by Mike Crute
parent 959968fa54
commit 3ceb90d1ff
2 changed files with 23 additions and 11 deletions
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26
README.md
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@ -9,8 +9,8 @@ and cloud platform support for small size and limited external dependencies.
## Requirements
The most important feature of this bootstrapper is the very limited set of
dependencies. In-fact this works with just busybox provided the wget applet is
built-in. The only required dependencies are:
dependencies. In-fact, this works with just busybox -- provided the wget applet
is built-in. The only required dependencies are:
- bash-like shell (e.g. bash, dash, ash)
- wget
@ -30,15 +30,23 @@ installing packages, and many other things. This bootstrap does not support
those things. Instead it supports:
- setting system hostname
- install user's configured SSH keys to the alpine user's authorized_keys file
- run any script-like user data (must start with #!)
- disable root and alpine password
- resize root partition to available disk space
- installing the instance's SSH keys in the EC2 user's authorized_keys file
- running any script-like user data (must start with #!)
- disabling root and the EC2 user's password
- resizing root partition to available disk space
These steps only run once. After the initial bootstrap the bootstrapper script
is a no-op. To force the script to run again at boot time remove the file
`/var/lib/cloud/.bootstrap-complete` and reboot the instance.
The default EC2 user is `alpine`; this can be overriden with a
`/etc/conf.d/tiny-ec2-bootstrap` containing...
```
EC2-USER="otheruser"
```
The EC2 user *must* already exist in the AMI -- `tiny-ec2-bootstrap` will
**NOT** add the user automatically.
## User Data
User data is provided at instance boot time and can be any arbitrary string of
@ -53,7 +61,7 @@ made at the point the script runs.
## Assumptions
- This was written for Alpine Linux and thus assumes that the login user is
called alpine. This could be configurable in the future but currently is not.
- This was written for Alpine Linux; use on other distributions has not been
tested.
- The script is run by OpenRC
- The script is run by OpenRC.

8
tiny-ec2-bootstrap
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@ -64,13 +64,17 @@ start() {
# Don't bootstrap if the host has already been bootstrapped
[ -f "/var/lib/cloud/.bootstrap-complete" ] && return 0
# load configuration, set defaults
[ -f "/etc/conf.d/tiny-ec2-bootstrap" ] && . /etc/conf.d/tiny-ec2-bootstrap
EC2_USER=${EC2_USER:-alpine}
[ -d "/var/lib/cloud" ] || mkdir -p /var/lib/cloud
ebegin "Disabling root password"; _disable_password root; eend $?
ebegin "Disabling alpine password"; _disable_password alpine; eend $?
ebegin "Disabling $EC2_USER password"; _disable_password "$EC2_USER"; eend $?
ebegin "Resizing root partition"; _resize_root_partition; eend $?
ebegin "Setting ec2 hostname"; _update_hostname; eend $?
ebegin "Setting ec2 user ssh keys"; _set_ssh_keys "alpine"; eend $?
ebegin "Setting ec2 user ssh keys"; _set_ssh_keys "$EC2_USER"; eend $?
ebegin "Running ec2 user data script"; _run_userdata; eend $?
touch "/var/lib/cloud/.bootstrap-complete"