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README.md

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+## Start Docker
+
+```sh
+# build dockerfile
+sudo docker build -t keepalived .
+
+# docker run
+sudo docker run -d --rm \
+--cap-add=NET_ADMIN \
+--net=host \
+-e KEEPALIVED_ROUTER_ID=1 \
+-e KEEPALIVED_STATE=MASTER \
+-e KEEPALIVED_PRIORITY=100 \
+-e KEEPALIVED_PASSWORD=1111 \
+-e KEEPALIVED_INTERFACE=ovs_eth0 \
+-e KEEPALIVED_UNICAST_PEERS=192.168.0.100,192.168.0.246 \
+-e KEEPALIVED_VIRTUAL_IPS=192.168.0.180 \
+keepalived
+```
+
+## Start docker compose
+```yml
+version: '3.5'
+
+services:
+  keepalived:
+    build: .
+    environment:
+      KEEPALIVED_ROUTER_ID: 1               # [require] RouterID
+      KEEPALIVED_STATE: MASTER              # Defualt State MASTER, BACKUP, default : BACKUP
+      KEEPALIVED_PRIORITY: 100              # priority, defualt : 1~199 random
+      KEEPALIVED_PASSWORD: 1111             # auth password
+      KEEPALIVED_INTERFACE: ovs_eth0        # [require] network interface in host
+      KEEPALIVED_UNICAST_PEERS: 192.168.0.100,192.168.0.246 # [require] peer clients, split comma
+      KEEPALIVED_VIRTUAL_IPS: 192.168.0.180 # [require] virtual ip, split comma
+    network_mode: host
+    cap_add:
+      - NET_ADMIN
+```
+