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Docs: image changes for Longhorn support
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.github/docs/longhorn.md
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.github/docs/longhorn.md
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# Longhorn on Constellatioin
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To build Longhorn compatible images, apply the following changes. Those stem from [their installation guide](https://longhorn.io/docs/1.3.2/deploy/install/#installation-requirements).
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```diff
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diff --git a/image/mkosi.conf.d/azure.conf b/image/mkosi.conf.d/azure.conf
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index bc4b707b..6de2254a 100644
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--- a/image/mkosi.conf.d/azure.conf
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+++ b/image/mkosi.conf.d/azure.conf
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@@ -1,3 +1,5 @@
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[Content]
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Packages=
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WALinuxAgent-udev
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+ nfs-utils
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+ iscsi-initiator-utils
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diff --git a/image/mkosi.skeleton/etc/fstab b/image/mkosi.skeleton/etc/fstab
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index e22f0b24..2e212267 100644
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--- a/image/mkosi.skeleton/etc/fstab
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+++ b/image/mkosi.skeleton/etc/fstab
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@@ -1,5 +1,6 @@
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/dev/mapper/state /run/state ext4 defaults,x-systemd.makefs,x-mount.mkdir 0 0
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/run/state/var /var none defaults,bind,x-mount.mkdir 0 0
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+/run/state/iscsi /etc/iscsi none defaults,bind,x-mount.mkdir 0 0
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/run/state/kubernetes /etc/kubernetes none defaults,bind,x-mount.mkdir 0 0
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/run/state/etccni /etc/cni/ none defaults,bind,x-mount.mkdir 0 0
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/run/state/opt /opt none defaults,bind,x-mount.mkdir 0 0
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diff --git a/image/mkosi.skeleton/usr/lib/systemd/system-preset/30-constellation.preset b/image/mkosi.skeleton/usr/lib/systemd/system-preset/30-constellation.preset
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index 24072c48..7b7498d6 100644
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--- a/image/mkosi.skeleton/usr/lib/systemd/system-preset/30-constellation.preset
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+++ b/image/mkosi.skeleton/usr/lib/systemd/system-preset/30-constellation.preset
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@@ -4,3 +4,5 @@ enable containerd.service
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enable kubelet.service
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enable systemd-networkd.service
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enable tpm-pcrs.service
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+enable iscsibefore.service
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+enable iscsid.service
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diff --git a/image/mkosi.skeleton/usr/lib/systemd/system/iscsibefore.service b/image/mkosi.skeleton/usr/lib/systemd/system/iscsibefore.service
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new file mode 100644
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index 00000000..355a2f83
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--- /dev/null
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+++ b/image/mkosi.skeleton/usr/lib/systemd/system/iscsibefore.service
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@@ -0,0 +1,12 @@
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+[Unit]
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+Description=before iscsid
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+Before=iscsid.service
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+ConditionPathExists=!/etc/iscsi/initiatorname.iscsi
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+
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+[Service]
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+Type=oneshot
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+ExecStart=/bin/bash -c "echo \"InitiatorName=$(/sbin/iscsi-iname)\" > /etc/iscsi/initiatorname.iscsi"
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+RemainAfterExit=yes
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+
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+[Install]
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+WantedBy=multi-user.target
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```
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