Garm External Provider For OCI

The OCI external provider allows garm to create Linux and Windows runners on top of OCI virtual machines.

Build

Clone the repo:

git clone https://github.com/cloudbase/garm-provider-oci

Build the binary:

cd garm-provider-oci
go build .

Copy the binary on the same system where garm is running, and point to it in the config.

Configure

The config file for this external provider is a simple toml used to configure the OCI credentials it needs to spin up virtual machines.

availability_domain = "mQqX:US-ASHBURN-AD-2"
compartment_id = "ocid1.compartment.oc1...fsbq"
subnet_id = "ocid1.subnet.oc1.iad....feoplaka"
network_security_group_id = "ocid1.networksecuritygroup....pfzya"
tenancy_id = "ocid1.tenancy.oc1..aaaaaaaajds7tbqbvrcaiavm2uk34t7wke7jg75aemsacljymbjxcio227oq"
user_id = "ocid1.user.oc1...ug6l37u6a"
region = "us-ashburn-1"
fingerprint = "38...6f:bb"
private_key_path = "/home/ubuntu/.oci/private_key.pem"
private_key_password = ""

Creating a pool

After you add it to garm as an external provider, you need to create a pool that uses it. Assuming you named your external provider as oci in the garm config, the following command should create a new pool:

garm-cli pool create \
    --os-type windows \
    --os-arch amd64 \
    --enabled=true \
    --flavor VM.Standard.E4.Flex \
    --image ocid1.image.oc1.iad.aaaaaaaamf7b6c6kvz2itjyflse6ibax2dgmqts2jlahl2zl3mbxlakv4h5a \
    --min-idle-runners 1 \
    --repo 26ae13a1-13e9-47ec-92c9-1526084684cf \
    --tags oci,windows \
    --provider-name oci

This will create a new Windows runner pool for the repo with ID 26ae13a1-13e9-47ec-92c9-1526084684cf on OCI, using the image specified by its OCID ocid1.image.oc1.iad.aaaaaaaamf7b6c6kvz2itjyflse6ibax2dgmqts2jlahl2zl3mbxlakv4h5a corresponding to Windows-Server-2022-Standard-Edition-VM-2024.01.09-0 for the region US-ASHBURN-1.

Here is an example for a Linux pool that uses the image specified by its image name:

garm-cli pool create \
    --os-type linux \
    --os-arch amd64 \
    --enabled=true \
    --flavor VM.Standard.E4.Flex \
    --image ocid1.image.oc1.iad.aaaaaaaah4rpzimrmnqfaxcm2xe3hdtegn4ukqje66rgouxakhvkaxer24oa \
    --min-idle-runners 0 \
    --repo 26ae13a1-13e9-47ec-92c9-1526084684cf \
    --tags oci,linux \
    --provider-name oci

Always find a recent image to use. For example, to see available Windows Server 2022 VM Images, you can access windows-server-2022-vm.

Tweaking the provider

Garm supports sending opaque json encoded configs to the IaaS providers it hooks into. This allows the providers to implement some very provider specific functionality that doesn't necessarily translate well to other providers. Features that may exists on OCI, may not exist on Azure or AWS and vice versa.

To this end, this provider supports the following extra specs schema:

{
    "$schema": "http://cloudbase.it/garm-provider-oci/schemas/extra_specs#",
    "type": "object",
    "properties": {
        "ocpus": {
            "type": "number",
            "description": "Number of OCPUs"
        },
        "memory_in_gbs": {
            "type": "number",
            "description": "Memory in GBs"
        },
        "boot_volume_size": {
            "type": "integer",
            "description": "Boot volume size in GB"
        },
        "ssh_public_keys": {
            "type": "array",
            "description": "List of SSH public keys",
            "items": {
                "type": "string",
                "description": "A SSH public key"
            }
        },
        "disable_updates": {
            "type": "boolean",
            "description": "Disable automatic updates on the VM."
        },
        "enable_boot_debug": {
            "type": "boolean",
            "description": "Enable boot debug on the VM."
        },
        "extra_packages": {
            "type": "array",
            "description": "Extra packages to install on the VM.",
            "items": {
                "type": "string"
            }
        },
        "runner_install_template": {
            "type": "string",
            "description": "This option can be used to override the default runner install template. If used, the caller is responsible for the correctness of the template as well as the suitability of the template for the target OS. Use the extra_context extra spec if your template has variables in it that need to be expanded."
        },
        "extra_context": {
            "type": "object",
            "description": "Extra context that will be passed to the runner_install_template.",
            "additionalProperties": {
                "type": "string"
            }
        },
        "pre_install_scripts": {
            "type": "object",
            "description": "A map of pre-install scripts that will be run before the runner install script. These will run as root and can be used to prep a generic image before we attempt to install the runner. The key of the map is the name of the script as it will be written to disk. The value is a byte array with the contents of the script.",
            "additionalProperties": {
                "type": "string"
            }
        }
    },
	"additionalProperties": false
}

An example of extra specs json would look like this:

{
    "ocpus": 1,
    "memory_in_gbs": 4,
    "boot_volume_size": 255,
    "ssh_public_keys": ["your key"],
    "disable_updates": true,
    "enable_boot_debug": true,
    "extra_context": {
        "GolangDownloadURL": "https://go.dev/dl/go1.22.4.linux-amd64.tar.gz"
    },
    "extra_packages": [
        "apg",
        "tmux"
    ],
    "pre_install_scripts": {
        "01-script": "IyEvYmluL2Jhc2gKCgplY2hvICJIZWxsbyBmcm9tICQwIiA+PiAvMDEtc2NyaXB0LnR4dAo=",
        "02-script": "IyEvYmluL2Jhc2gKCgplY2hvICJIZWxsbyBmcm9tICQwIiA+PiAvMDItc2NyaXB0LnR4dAo="
    },
    "runner_install_template": "#!/bin/bash

set -e
set -o pipefail

{{- if .EnableBootDebug }}
set -x
{{- end }}

CALLBACK_URL="{{ .CallbackURL }}"
METADATA_URL="{{ .MetadataURL }}"
BEARER_TOKEN="{{ .CallbackToken }}"

if [ -z "$METADATA_URL" ];then
	echo "no token is available and METADATA_URL is not set"
	exit 1
fi

function call() {
	PAYLOAD="$1"
	[[ $CALLBACK_URL =~ ^(.*)/status(/)?$ ]] || CALLBACK_URL="${CALLBACK_URL}/status"
	curl --retry 5 --retry-delay 5 --retry-connrefused --fail -s -X POST -d "${PAYLOAD}" -H 'Accept: application/json' -H "Authorization: Bearer ${BEARER_TOKEN}" "${CALLBACK_URL}" || echo "failed to call home: exit code ($?)"
}

function systemInfo() {
	if [ -f "/etc/os-release" ];then
		. /etc/os-release
	fi
	OS_NAME=${NAME:-""}
	OS_VERSION=${VERSION_ID:-""}
	AGENT_ID=${1:-null}
	# strip status from the callback url
	[[ $CALLBACK_URL =~ ^(.*)/status(/)?$ ]] && CALLBACK_URL="${BASH_REMATCH[1]}" || true
	SYSINFO_URL="${CALLBACK_URL}/system-info/"
	PAYLOAD="{\"os_name\": \"$OS_NAME\", \"os_version\": \"$OS_VERSION\", \"agent_id\": $AGENT_ID}"
	curl --retry 5 --retry-delay 5 --retry-connrefused --fail -s -X POST -d "${PAYLOAD}" -H 'Accept: application/json' -H "Authorization: Bearer ${BEARER_TOKEN}" "${SYSINFO_URL}" || true
}

function sendStatus() {
	MSG="$1"
	call "{\"status\": \"installing\", \"message\": \"$MSG\"}"
}

function success() {
	MSG="$1"
	ID=${2:-null}
	call "{\"status\": \"idle\", \"message\": \"$MSG\", \"agent_id\": $ID}"
}

function fail() {
	MSG="$1"
	call "{\"status\": \"failed\", \"message\": \"$MSG\"}"
	exit 1
}

# This will echo the version number in the filename. Given a file name like: actions-runner-osx-x64-2.299.1.tar.gz
# this will output: 2.299.1
function getRunnerVersion() {
	FILENAME="{{ .FileName }}"
	[[ $FILENAME =~ ([0-9]+\.[0-9]+\.[0-9+]) ]]
	echo $BASH_REMATCH
}

function getCachedToolsPath() {
	CACHED_RUNNER="/opt/cache/actions-runner/latest"
	if [ -d "$CACHED_RUNNER" ];then
		echo "$CACHED_RUNNER"
		return 0
	fi

	VERSION=$(getRunnerVersion)
	if [ -z "$VERSION" ]; then
		return 0
	fi

	CACHED_RUNNER="/opt/cache/actions-runner/$VERSION"
	if [ -d "$CACHED_RUNNER" ];then
		echo "$CACHED_RUNNER"
		return 0
	fi
	return 0
}

function downloadAndExtractRunner() {
	sendStatus "downloading tools from {{ .DownloadURL }}"
	if [ ! -z "{{ .TempDownloadToken }}" ]; then
	TEMP_TOKEN="Authorization: Bearer {{ .TempDownloadToken }}"
	fi
	curl --retry 5 --retry-delay 5 --retry-connrefused --fail -L -H "${TEMP_TOKEN}" -o "/home/{{ .RunnerUsername }}/{{ .FileName }}" "{{ .DownloadURL }}" || fail "failed to download tools"
	mkdir -p /home/{{ .RunnerUsername }}/actions-runner || fail "failed to create actions-runner folder"
	sendStatus "extracting runner"
	tar xf "/home/{{ .RunnerUsername }}/{{ .FileName }}" -C /home/{{ .RunnerUsername }}/actions-runner/ || fail "failed to extract runner"
	# chown {{ .RunnerUsername }}:{{ .RunnerGroup }} -R /home/{{ .RunnerUsername }}/actions-runner/ || fail "failed to change owner"
}

CACHED_RUNNER=$(getCachedToolsPath)
if [ -z "$CACHED_RUNNER" ];then
	downloadAndExtractRunner
	sendStatus "installing dependencies"
	cd /home/{{ .RunnerUsername }}/actions-runner
	sudo ./bin/installdependencies.sh || fail "failed to install dependencies"
else
	sendStatus "using cached runner found in $CACHED_RUNNER"
	sudo cp -a "$CACHED_RUNNER"  "/home/{{ .RunnerUsername }}/actions-runner"
	sudo chown {{ .RunnerUsername }}:{{ .RunnerGroup }} -R "/home/{{ .RunnerUsername }}/actions-runner" || fail "failed to change owner"
	cd /home/{{ .RunnerUsername }}/actions-runner
fi


sendStatus "configuring runner"
{{- if .UseJITConfig }}
function getRunnerFile() {
	curl --retry 5 --retry-delay 5 \
		--retry-connrefused --fail -s \
		-X GET -H 'Accept: application/json' \
		-H "Authorization: Bearer ${BEARER_TOKEN}" \
		"${METADATA_URL}/$1" -o "$2"
}

sendStatus "downloading JIT credentials"
getRunnerFile "credentials/runner" "/home/{{ .RunnerUsername }}/actions-runner/.runner" || fail "failed to get runner file"
getRunnerFile "credentials/credentials" "/home/{{ .RunnerUsername }}/actions-runner/.credentials" || fail "failed to get credentials file"
getRunnerFile "credentials/credentials_rsaparams" "/home/{{ .RunnerUsername }}/actions-runner/.credentials_rsaparams" || fail "failed to get credentials_rsaparams file"
getRunnerFile "system/service-name" "/home/{{ .RunnerUsername }}/actions-runner/.service" || fail "failed to get service name file"
sed -i 's/$/\.service/' /home/{{ .RunnerUsername }}/actions-runner/.service

SVC_NAME=$(cat /home/{{ .RunnerUsername }}/actions-runner/.service)

sendStatus "generating systemd unit file"
getRunnerFile "systemd/unit-file?runAsUser={{ .RunnerUsername }}" "$SVC_NAME" || fail "failed to get service file"
sudo mv $SVC_NAME /etc/systemd/system/ || fail "failed to move service file"
sudo chown root:root /etc/systemd/system/$SVC_NAME || fail "failed to change owner"
if [ -e "/sys/fs/selinux" ];then
	sudo chcon -h system_u:object_r:systemd_unit_file_t:s0 /etc/systemd/system/$SVC_NAME || fail "failed to change selinux context"
fi

sendStatus "enabling runner service"
cp /home/{{ .RunnerUsername }}/actions-runner/bin/runsvc.sh /home/{{ .RunnerUsername }}/actions-runner/ || fail "failed to copy runsvc.sh"
sudo chown {{ .RunnerUsername }}:{{ .RunnerGroup }} -R /home/{{ .RunnerUsername }} || fail "failed to change owner"
sudo systemctl daemon-reload || fail "failed to reload systemd"
sudo systemctl enable $SVC_NAME
{{- else}}

GITHUB_TOKEN=$(curl --retry 5 --retry-delay 5 --retry-connrefused --fail -s -X GET -H 'Accept: application/json' -H "Authorization: Bearer ${BEARER_TOKEN}" "${METADATA_URL}/runner-registration-token/")

set +e
attempt=1
while true; do
	ERROUT=$(mktemp)
	{{- if .GitHubRunnerGroup }}
	./config.sh --unattended --url "{{ .RepoURL }}" --token "$GITHUB_TOKEN" --runnergroup {{.GitHubRunnerGroup}} --name "{{ .RunnerName }}" --labels "{{ .RunnerLabels }}" --no-default-labels --ephemeral 2>$ERROUT
	{{- else}}
	./config.sh --unattended --url "{{ .RepoURL }}" --token "$GITHUB_TOKEN" --name "{{ .RunnerName }}" --labels "{{ .RunnerLabels }}" --no-default-labels --ephemeral 2>$ERROUT
	{{- end}}
	if [ $? -eq 0 ]; then
		rm $ERROUT || true
		sendStatus "runner successfully configured after $attempt attempt(s)"
		break
	fi
	LAST_ERR=$(cat $ERROUT)
	echo "$LAST_ERR"

	# if the runner is already configured, remove it and try again. In the past configuring a runner
	# managed to register it but timed out later, resulting in an error.
	./config.sh remove --token "$GITHUB_TOKEN" || true

	if [ $attempt -gt 5 ];then
		rm $ERROUT || true
		fail "failed to configure runner: $LAST_ERR"
	fi

	sendStatus "failed to configure runner (attempt $attempt): $LAST_ERR (retrying in 5 seconds)"
	attempt=$((attempt+1))
	rm $ERROUT || true
	sleep 5
done
set -e

sendStatus "installing runner service"
sudo ./svc.sh install {{ .RunnerUsername }} || fail "failed to install service"
{{- end}}

if [ -e "/sys/fs/selinux" ];then
	sudo chcon -R -h user_u:object_r:bin_t:s0 /home/runner/ || fail "failed to change selinux context"
fi

AGENT_ID=""
{{- if .UseJITConfig }}
sudo systemctl start $SVC_NAME || fail "failed to start service"
{{- else}}
sendStatus "starting service"
sudo ./svc.sh start || fail "failed to start service"

set +e
AGENT_ID=$(grep "agentId" /home/{{ .RunnerUsername }}/actions-runner/.runner |  tr -d -c 0-9)
if [ $? -ne 0 ];then
	fail "failed to get agent ID"
fi
set -e
{{- end}}
systemInfo $AGENT_ID

success "runner successfully installed" $AGENT_ID
{{- if .ExtraContext.GolangDownloadURL }}
curl -LO {{ .ExtraContext.GolangDownloadURL }}
rm -rf /usr/local/go && sudo tar -C /usr/local -xzf go1.22.4.linux-amd64.tar.gz
export PATH=$PATH:/usr/local/go/bin
{{- end }}"
    }

NOTE: The extra_context spec adds a map of key/value pairs that may be expected in the runner_install_template. The runner_install_template allows us to completely override the script that installs and starts the runner. In the example above, I have added a copy of the current template from garm-provider-common, with the adition of:

{{- if .ExtraContext.GolangDownloadURL }}
curl -LO {{ .ExtraContext.GolangDownloadURL }}
rm -rf /usr/local/go && sudo tar -C /usr/local -xzf go1.22.4.linux-amd64.tar.gz
export PATH=$PATH:/usr/local/go/bin
{{- end }}

NOTE: runner_install_template is a golang template, which is used to install the runner. An example on how you can extend the currently existing template with a function that downloads, extracts and installs Go on the runner is provided above.

To set it on an existing pool, simply run:

garm-cli pool update --extra-specs='{"boot_volume_size" : 100}' <POOL_ID>

You can also set a spec when creating a new pool, using the same flag.

Workers in that pool will be created taking into account the specs you set on the pool.