Merge pull request #320 from f-higashi/docker_multinode_centos

Fix docker options setting in CentOS

docs/getting-started-guides/docker-multinode/master.sh

@@ -176,7 +176,7 @@ start_k8s(){
             ;;
         centos)
             DOCKER_CONF="/etc/sysconfig/docker"
-            echo "OPTIONS=\"\$OPTIONS --mtu=${FLANNEL_MTU} --bip=${FLANNEL_SUBNET}\"" | tee -a ${DOCKER_CONF}
+            sed -i "/^OPTIONS=/ s|\( --mtu=.*\)\?'$| --mtu=${FLANNEL_MTU} --bip=${FLANNEL_SUBNET}'|" ${DOCKER_CONF}
             if ! command_exists ifconfig; then
                 yum -y -q install net-tools
             fi

docs/getting-started-guides/docker-multinode/worker.sh

@@ -149,7 +149,7 @@ start_k8s() {
     case "${lsb_dist}" in
         centos)
             DOCKER_CONF="/etc/sysconfig/docker"
-            echo "OPTIONS=\"\$OPTIONS --mtu=${FLANNEL_MTU} --bip=${FLANNEL_SUBNET}\"" | tee -a ${DOCKER_CONF}
+            sed -i "/^OPTIONS=/ s|\( --mtu=.*\)\?'$| --mtu=${FLANNEL_MTU} --bip=${FLANNEL_SUBNET}'|" ${DOCKER_CONF}
             if ! command_exists ifconfig; then
                 yum -y -q install net-tools
             fi