Merge pull request ClickHouse#88764 from ClickHouse/backport/25.8/88746

Backport ClickHouse#88746 to 25.8: Startup clickhouse-keeper on boot

Author: clickhouse-gh[bot]

packages/clickhouse-keeper.postinstall

@@ -28,6 +28,25 @@ if [ "$1" = configure ] || [ -n "$not_deb_os" ]; then
             "${KEEPER_USER}"
     fi
 
+    if [ -x "/bin/systemctl" ] && [ -f /lib/systemd/system/clickhouse-keeper.service ] && [ -d /run/systemd/system ]; then
+        # if old rc.d service present - remove it
+        if [ -x "/etc/init.d/clickhouse-keeper" ] && [ -x "/usr/sbin/update-rc.d" ]; then
+            /usr/sbin/update-rc.d clickhouse-keeper remove
+        fi
+
+        /bin/systemctl daemon-reload
+        /bin/systemctl enable clickhouse-keeper
+    else
+        # If you downgrading to version older than 1.1.54336 run: systemctl disable clickhouse-keeper
+        if [ -x "/etc/init.d/clickhouse-keeper" ]; then
+            if [ -x "/usr/sbin/update-rc.d" ]; then
+                /usr/sbin/update-rc.d clickhouse-keeper defaults 19 19 >/dev/null || exit $?
+            else
+                echo # Other OS
+            fi
+        fi
+    fi
+
     chown -R "${KEEPER_USER}:${KEEPER_GROUP}" "${KEEPER_CONFDIR}"
     chmod 0755 "${KEEPER_CONFDIR}"