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authorMitja Felicijan <mitja.felicijan@gmail.com>2023-10-31 08:38:25 +0100
committerMitja Felicijan <mitja.felicijan@gmail.com>2023-10-31 08:38:25 +0100
commitf59672679db271f6b24a41e215401ab5001ecd96 (patch)
tree367e04e449d8b02266b05d37413cfd2ba2a80b3a /public/running-golang-application-as-pid1.html
parent22f5ac8fcec4dbfcc1f5033f18bc4eeca52a747d (diff)
downloadmitjafelicijan.com-f59672679db271f6b24a41e215401ab5001ecd96.tar.gz
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1<!doctype html><html lang=en-us><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=generator content="JBMAFP - github.com/mitjafelicijan/jbmafp"><link href="data:image/x-icon;base64,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" rel=icon type=image/x-icon><title>Running Golang application as PID 1 with Linux kernel</title><meta name=description content="Unikernels, kernels, and alikeI have been reading a lot aboutunikernernels lately and found themvery intriguing."><link rel=alternate type=application/rss+xml title="Mitja Felicijan's posts" href=https://mitjafelicijan.com/index.xml><link rel=alternate type=application/rss+xml title="Mitja Felicijan's notes" href=https://mitjafelicijan.com/notes.xml><style>:root{--border-color:gainsboro}body{padding:2.5rem;max-width:1900px;background:#fff;font-family:sans-serif;line-height:1.35rem;font-size:16px}hr{margin-block-start:1.5rem}a{color:blue;text-decoration:none}h1,h2,h3{line-height:initial}h1{font-size:xx-large}footer{margin-block-start:2rem}cap{text-transform:capitalize}blockquote{font-style:italic}table{max-width:100%;border:1px solid var(--border-color);border-collapse:separate;border-spacing:0}table thead tr th{border-bottom:1px solid var(--border-color)}table th,table td{padding:.3em .5em}ul.list li{padding:.2em 0}ul{line-height:1.35em}pre{text-wrap:nowrap;overflow-x:auto;padding:0 1em;border:1px solid var(--border-color)}code{padding:0 3px;font-size:14px;border:0}pre code{line-height:1.3em}pre,code,pre *,code *{font-family:monospace}figure{margin-inline-start:0;margin-inline-end:0}figcaption{text-align:center}figcaption p{margin:.3em 0 0}img,video,audio{width:800px;max-width:100%}header nav{display:flex;gap:.9rem}@media only screen and (max-width:600px){body{padding:.5em;word-wrap:break-word}header nav{gap:.7rem}header nav .hob{display:none}a{word-wrap:break-word}}</style><header><nav class=main itemscope itemtype=http://schema.org/SiteNavigationElement role=toolbar><a href=/>Home</a> 1<!doctype html><html lang=en-us><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=generator content="JBMAFP - 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2<a href=/#posts>Posts</a> 2<a href=/#posts>Posts</a>
3<a href=/#notes>Notes</a> 3<a href=/#notes>Notes</a>
4<a href=/#sideprojects class=hob>Side Projects</a> 4<a href=/#sideprojects class=hob>Side Projects</a>
@@ -62,12 +62,12 @@ use the 64bit version.<h2 id=compiling-linux-kernel>Compiling Linux kernel</h2><
62</span></span></code></pre><p>At this point we have kernel image that is located in <code>arch/x86_64/boot/bzImage</code>. 62</span></span></code></pre><p>At this point we have kernel image that is located in <code>arch/x86_64/boot/bzImage</code>.
63We will use this in QEMU later.<p>To make our lives a bit easier lets move the kernel image to another place. 63We will use this in QEMU later.<p>To make our lives a bit easier lets move the kernel image to another place.
64Lets create a folder <code>bin/</code> in the root of our project with <code>mkdir -p bin</code>.<p>At this point we can copy <code>bzImage</code> to <code>bin/</code> folder with 64Lets create a folder <code>bin/</code> in the root of our project with <code>mkdir -p bin</code>.<p>At this point we can copy <code>bzImage</code> to <code>bin/</code> folder with
65<code>cp linux-5.15.7/arch/x86_64/boot/bzImage bin/bzImage</code>.<p>The folder structure of this experiment should look like this.<pre><code>pid1/ 65<code>cp linux-5.15.7/arch/x86_64/boot/bzImage bin/bzImage</code>.<p>The folder structure of this experiment should look like this.<pre tabindex=0 style=background-color:#fff><code><span style=display:flex><span>pid1/
66 bin/ 66</span></span><span style=display:flex><span> bin/
67 bzImage 67</span></span><span style=display:flex><span> bzImage
68 linux-5.15.7/ 68</span></span><span style=display:flex><span> linux-5.15.7/
69 linux-5.15.7.tar.xz 69</span></span><span style=display:flex><span> linux-5.15.7.tar.xz
70</code></pre><h2 id=preparing-pid-1-application-in-golang>Preparing PID 1 application in Golang</h2><p>This step is relatively easy. The only thing we must have in mind that we will 70</span></span></code></pre><h2 id=preparing-pid-1-application-in-golang>Preparing PID 1 application in Golang</h2><p>This step is relatively easy. The only thing we must have in mind that we will
71need to compile the binary as a static one.<p>Let's create <code>init.go</code> file in the root of the project.<pre tabindex=0 style=background-color:#fff><code><span style=display:flex><span><span style=color:#00f>package</span> main 71need to compile the binary as a static one.<p>Let's create <code>init.go</code> file in the root of the project.<pre tabindex=0 style=background-color:#fff><code><span style=display:flex><span><span style=color:#00f>package</span> main
72</span></span><span style=display:flex><span> 72</span></span><span style=display:flex><span>
73</span></span><span style=display:flex><span><span style=color:#00f>import</span> ( 73</span></span><span style=display:flex><span><span style=color:#00f>import</span> (
@@ -94,14 +94,14 @@ and/or exit. That would result in a kernel panic. Which is BAD!<p>There are two
94is a cpio archive of the initial file system that gets loaded into memory 94is a cpio archive of the initial file system that gets loaded into memory
95during the Linux startup process).<pre tabindex=0 style=background-color:#fff><code><span style=display:flex><span>$ echo init | cpio -o --format=newc &gt; initramfs 95during the Linux startup process).<pre tabindex=0 style=background-color:#fff><code><span style=display:flex><span>$ echo init | cpio -o --format=newc &gt; initramfs
96</span></span><span style=display:flex><span>$ mv initramfs bin/initramfs 96</span></span><span style=display:flex><span>$ mv initramfs bin/initramfs
97</span></span></code></pre><p>The projects at this stage should look like this.<pre><code>pid1/ 97</span></span></code></pre><p>The projects at this stage should look like this.<pre tabindex=0 style=background-color:#fff><code><span style=display:flex><span>pid1/
98 bin/ 98</span></span><span style=display:flex><span> bin/
99 bzImage 99</span></span><span style=display:flex><span> bzImage
100 initramfs 100</span></span><span style=display:flex><span> initramfs
101 linux-5.15.7/ 101</span></span><span style=display:flex><span> linux-5.15.7/
102 linux-5.15.7.tar.xz 102</span></span><span style=display:flex><span> linux-5.15.7.tar.xz
103 init.go 103</span></span><span style=display:flex><span> init.go
104</code></pre><h2 id=running-all-of-it-with-qemu>Running all of it with QEMU</h2><p><a href=https://www.qemu.org/>QEMU</a> is a free and open-source hypervisor. It emulates 104</span></span></code></pre><h2 id=running-all-of-it-with-qemu>Running all of it with QEMU</h2><p><a href=https://www.qemu.org/>QEMU</a> is a free and open-source hypervisor. It emulates
105the machine's processor through dynamic binary translation and provides a set 105the machine's processor through dynamic binary translation and provides a set
106of different hardware and device models for the machine, enabling it to run a 106of different hardware and device models for the machine, enabling it to run a
107variety of guest operating systems.<pre tabindex=0 style=background-color:#fff><code><span style=display:flex><span>$ qemu-system-x86_64 -serial stdio -kernel bin/bzImage -initrd bin/initramfs -append <span style=color:#a31515>&#34;console=ttyS0&#34;</span> -m 128 107variety of guest operating systems.<pre tabindex=0 style=background-color:#fff><code><span style=display:flex><span>$ qemu-system-x86_64 -serial stdio -kernel bin/bzImage -initrd bin/initramfs -append <span style=color:#a31515>&#34;console=ttyS0&#34;</span> -m 128
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