74 lines
2.7 KiB
Org Mode
74 lines
2.7 KiB
Org Mode
#+TITLE: Running web assembly in containers
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#+AUTHOR: James Blair
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#+DATE: <2023-01-31 Tue 13:00>
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In our recent [[https://www.redhat.com/en/blog/red-hat-and-webassembly][blog post]] on Web Assembly we highlighted the implementation of WASM support into the [[https://github.com/containers/crun/][crun]] Open Container Initiative (OCI) runtime. This change paves the way for Podman and OpenShift to run WASM workloads.
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This demo will step through how WASM modules can be run alongside traditional workloads in Podman.
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* Install wasm runtime
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Our first pre-requisite step is to ensure our machine has a WASM runtime installed. For this demo we will use [[https://wasmedge.org/][WasmEdge]].
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Run the code block below to install WasmEdge into the ~/usr/local/~ dir using the project install script.
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#+NAME: Install wasmedge
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#+begin_src tmate :socket /tmp/james.tmate.tmate
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# Install via script
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curl -sSf https://raw.githubusercontent.com/WasmEdge/WasmEdge/master/utils/install.sh | sudo bash -s -- -p /usr/local
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# Verify installed version
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wasmedge --version
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#+end_src
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* Compile crun with wasm support
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Once ~wasmedge~ is available we then need to ensure we have a version of ~crun~ available that has support for WASM. In my case I needed to download and compile a newer release including the ~--with-wasmedge~ compile flag.
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We need to start with installing compile dependencies, these are listed [[https://github.com/containers/crun#ubuntu][here]] in the official docs.
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#+NAME: Install compile dependencies
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#+begin_src tmate :socket /tmp/james.tmate.tmate
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sudo apt-get install --yes make git gcc build-essential pkgconf libtool libsystemd-dev libprotobuf-c-dev libcap-dev libseccomp-dev libyajl-dev libgcrypt20-dev go-md2man autoconf python3 automake
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#+end_src
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Once the required dependencies are present on our system we can clone down the source and compile it with the additional wasmedge flag.
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#+NAME: Compile crun with wasmedge
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#+begin_src tmate :socket /tmp/james.tmate.tmate
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# Clone the crun source
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git clone https://github.com/containers/crun && cd crun
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# Compile with wasm flag
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./autogen.sh
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./configure --with-wasmedge
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make
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sudo make install
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# Cleanup the crun source
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cd ../ and rm -rf crun
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#+end_src
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If everything worked correctly we can see the ~+WASM:wasmedge~ flag in our crun version information:
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#+NAME: Check crun flags
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#+begin_src tmate :socket /tmp/james.tmate.tmate
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crun --version
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#+end_src
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The output should look something like the example below:
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#+RESULTS: Check crun flags results
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#+begin_src bash
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crun version 1.7.2.0.0.0.80-940b
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commit: 940bf973f144c81149cf05135f127ca6f0d19eb6
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rundir: /run/user/1000/crun
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spec: 1.0.0
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+SYSTEMD +SELINUX +APPARMOR +CAP +SECCOMP +EBPF +WASM:wasmedge +YAJL
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#+end_src
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