Dave Cottlehuber dch

List of commands available inside FreeBSD OCI containers

There are complaints that FreeBSD OCI containers have limited functionality as certain programs do not exist, like chown, which, tail, su and many others.

To help people find alternative commands to use inside the container, a list of commands is provided below.

The list was generated by performing the following steps

git clone https://github.com/bretton/temporary-micropod
cd temporary-micropod/emptyrun

This will pull in source code for podman, buildah and related modules, build everything and install to /usr/local. This all happens in a directory named 'build' which can be deleted to clean up or to force a clean build.

mkdir -p build
fetch https://gist.github.com/dfr/ac4dc043ee3780b690c5887a61f53494/raw/1e55da486792ffda61c9d6070d5d834888be9590/buildah-install.sh
chmod +x buildah-install.sh
(cd build && ../buildah-install.sh)

Make a container and run things inside it:

This is a simple example program using the foundationdb C API. Its written & tested on macos; but it should be easy to adapt to work on BSD / linux.

This also demonstrates using libuv to integrate foundationdb into a run loop. Promises are run in the main libuv loop.

Compile with

$ clang test.c -Wall -lfdb_c -I/usr/local/include -luv

When does terminate/2 get called in a gen_server?

This is what the [official documentation][1] says about the terminate/2 callback for a gen_server:

This function is called by a gen_server when it is about to terminate. It should be the opposite of Module:init/1 and do any necessary cleaning up. When it returns, the gen_server terminates with Reason. The return value is ignored.

Reason is a term denoting the stop reason and State is the internal state of the gen_server.

Reason depends on why the gen_server is terminating. If it is because another callback function has returned a stop tuple {stop,..}, Reason will have the value specified in that tuple. If it is due to a failure, Reason is the error reason.

	-module(systemd).
	% This is what you need to adopt systemd in erlang
	%
	% Do whatever you want license. If you want, you can take this code under terms of MIT license.

	-export([ready/0, reloading/0, stopping/0, watchdog/0]).

	-export([start_link/0]).
	-export([init/1, handle_info/2, terminate/2]).

	Originally from: http://erlang.org/pipermail/erlang-questions/2017-August/093170.html

	For a safe and fast Erlang SSL server, there's a few
	configuration values you might want by default:

	[{ciphers, CipherList}, % see below
	{honor_cipher_order, true}, % pick the server-defined order of ciphers
	{secure_renegotiate, true}, % prevent renegotiation hijacks
	{client_renegotiation, false}, % prevent clients DoSing w/ renegs
	{versions, ['tlsv1.2', 'tlsv1.1']}, % add tlsv1 if you must

	#!/usr/bin/env bash
	#
	# gh-dl-release! It works!
	#
	# This script downloads an asset from latest or specific Github release of a
	# private repo. Feel free to extract more of the variables into command line
	# parameters.
	#
	# PREREQUISITES
	#

	defmodule MyApp.Mixfile do
	use Mix.Project

	def project do
	[app: :my_app,
	version: get_version,
	elixir: "~> 1.0",
	elixirc_paths: elixirc_paths(Mix.env),
	compilers: Mix.compilers,
	build_embedded: Mix.env == :prod,

	#!/usr/bin/env escript
	%%
	%%

	-mode(compile).
	-compile(export_all).


	main([Port]) ->
	{ok, _} = application:ensure_all_started(ssh),

	#!/bin/bash
	#json per line (same result, but for example can use jq to set _id)
	7z x -so $1 \| jq -c . \| couchimport --db mydb --type jsonl