etcd: add systemd unit support for clustering

Refer https://etcd.io/docs/v3.5/op-guide/clustering/ for etcd clustering design background details. etcd-new.service triggers only, when the config file available in the specified path. This generic serive helps to start etcd cluster based on the project specific use cases and config files. etcd-new.service only required to run on initial setup or new node add into the existing cluster. All other use cases use regular etcd.service to start etcd with existing cluster configuration. Signed-off-by: ojayanth <[email protected]> Signed-off-by: Khem Raj <[email protected]>
openembedded · May 12, 2023 · a179653 · a179653
1 parent 9400a94
commit a179653
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Showing 3 changed files with 29 additions and 1 deletion.
diff --git a/meta-oe/recipes-extended/etcd/etcd/etcd-new.path b/meta-oe/recipes-extended/etcd/etcd/etcd-new.path
@@ -0,0 +1,9 @@
+[Unit]
+Description=Monitor the etcd config file changes
+
+[Path]
+PathChanged=/run/etcd-new.conf
+Unit=etcd-new.service
+
+[Install]
+WantedBy=multi-user.target
diff --git a/meta-oe/recipes-extended/etcd/etcd/etcd-new.service b/meta-oe/recipes-extended/etcd/etcd/etcd-new.service
@@ -0,0 +1,15 @@
+[Unit]
+Description=etcd cluster member start/add service
+Documentation=https://etcd.io/docs/v3.5/op-guide/clustering/
+ConditionPathExists=!/var/lib/etcd/member
+ConditionPathExists=/run/etcd-new.conf
+OnFailure=etcd.service
+
+[Service]
+Type=notify
+EnvironmentFile=/run/etcd-new.conf
+ExecStart=/usr/bin/etcd
+Restart=no
+
+[Install]
+WantedBy=multi-user.target
diff --git a/meta-oe/recipes-extended/etcd/etcd_3.5.7.bb b/meta-oe/recipes-extended/etcd/etcd_3.5.7.bb
@@ -10,6 +10,8 @@ SRC_URI = " \
     file://0001-test_lib.sh-remove-gobin-requirement-during-build.patch;patchdir=src/${GO_IMPORT} \
     file://etcd.service \
     file://etcd-existing.conf \
+    file://etcd-new.service \
+    file://etcd-new.path \
 "
 
 SRCREV = "215b53cf3b48ee761f4c40908b3874b2e5e95e9f"
@@ -53,7 +55,7 @@ go_do_compile:prepend() {
 
 REQUIRED_DISTRO_FEATURES = "systemd"
 SYSTEMD_PACKAGES = "${PN}"
-SYSTEMD_SERVICE:${PN}:append = " etcd.service"
+SYSTEMD_SERVICE:${PN}:append = " etcd.service etcd-new.service etcd-new.path"
 
 do_install:append() {
     install -d ${D}${bindir}/
@@ -63,6 +65,8 @@ do_install:append() {
     install -m 0644 ${WORKDIR}/etcd-existing.conf -D -t ${D}${sysconfdir}/etcd.d
     install -d ${D}${systemd_system_unitdir}
     install -m 0644 ${WORKDIR}/etcd.service ${D}${systemd_system_unitdir}/
+    install -m 0644 ${WORKDIR}/etcd-new.service ${D}${systemd_system_unitdir}/
+    install -m 0644 ${WORKDIR}/etcd-new.path ${D}${systemd_system_unitdir}/
 }
 
 FILES:${PN}:append = " ${sysconfdir}/etcd.d/etcd-existing.conf"