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The Lounge What is on Your Mind? Popularity-Boost for the POSIX-Shell in the Era of Containerized Computing? Post 303028311 by stomp on Friday 4th of January 2019 08:17:28 AM
Old 01-04-2019
Popularity-Boost for the POSIX-Shell in the Era of Containerized Computing?

Not even thinking that POSIX-Shell is deprecated, but I like working with bash very much, because of it's increased comfort and advanced functions. And in my world here it's available everywhere as default.

Working with kubernetes now, it seems there is a paradigm shift in terms of resources. Small is beautiful is one old and new slogan here. Faster to backup, Faster to set up, Less I/O. A popular linux distribution for containers is alpine linux: Default Installed Image size: ~5 MB. Based on busybox and musl.

With kubernetes(or with other container technology) you can use resources far more effectively and that's why small resource footprint gains you really much in terms of how many applications can I run on the cluster?

Want to install bash? Nearly Triples space usage of that whole system. So size really matters...

Debian/Ubuntu docker base images are at 80-120 MB with my final app images(small apps) around 200-400 MB.
 

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OCF_HEARTBEAT_LXC(7)						OCF resource agents					      OCF_HEARTBEAT_LXC(7)

NAME
ocf_heartbeat_lxc - Manages LXC containers SYNOPSIS
lxc [start | stop | monitor | meta-data | validate-all] DESCRIPTION
Allows LXC containers to be managed by the cluster. If the container is running "init" it will also perform an orderly shutdown. It is 'assumed' that the 'init' system will do an orderly shudown if presented with a 'kill -PWR' signal. On a 'sysvinit' this would require the container to have an inittab file containing "p0::powerfail:/sbin/init 0" I have absolutly no idea how this is done with 'upstart' or 'systemd', YMMV if your container is using one of them. SUPPORTED PARAMETERS
container The unique name for this 'Container Instance' e.g. 'test1'. (unique, required, string, no default) config Absolute path to the file holding the specific configuration for this container e.g. '/etc/lxc/test1/config'. (required, string, no default) log Absolute path to the container log file (optional, string, default /var/run/resource-agents/default.log) use_screen Provides the option of capturing the 'root console' from the container and showing it on a separate screen. To see the screen output run 'screen -r {container name}' The default value is set to 'false', change to 'true' to activate this option (optional, boolean, default false) SUPPORTED ACTIONS
This resource agent supports the following actions (operations): start Starts the resource. Suggested minimum timeout: 10. stop Stops the resource. Suggested minimum timeout: 30. monitor Performs a detailed status check. Suggested minimum timeout: 20. Suggested interval: 60. validate-all Performs a validation of the resource configuration. Suggested minimum timeout: 20. meta-data Retrieves resource agent metadata (internal use only). Suggested minimum timeout: 5. EXAMPLE
The following is an example configuration for a lxc resource using the crm(8) shell: primitive p_lxc ocf:heartbeat:lxc params container=string config=string op monitor timeout="20" interval="60" depth="0" SEE ALSO
http://www.linux-ha.org/wiki/lxc_(resource_agent) AUTHOR
Linux-HA contributors (see the resource agent source for information about individual authors) resource-agents UNKNOWN 03/09/2014 OCF_HEARTBEAT_LXC(7)
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