diff --git a/appendix/tricks.md b/appendix/tricks.md
index 0795b2a6e..fca210a24 100644
--- a/appendix/tricks.md
+++ b/appendix/tricks.md
@@ -35,7 +35,7 @@ spec:
 
 我们可以在 Pod 中为容器使用 command 为容器指定启动参数：
 
-```Bash
+```bash
 command: ["/bin/bash","-c","bootstrap.sh"]
 ```
 
diff --git a/concepts/cronjob.md b/concepts/cronjob.md
index 510beeb98..872357286 100644
--- a/concepts/cronjob.md
+++ b/concepts/cronjob.md
@@ -59,7 +59,7 @@ spec:
           restartPolicy: OnFailure
 ```
 
-```Bash
+```bash
 $ kubectl create -f cronjob.yaml
 cronjob "hello" created
 ```
diff --git a/concepts/garbage-collection.md b/concepts/garbage-collection.md
index 5f0ed0084..3d6a3a6a1 100644
--- a/concepts/garbage-collection.md
+++ b/concepts/garbage-collection.md
@@ -121,7 +121,7 @@ kubectl 也支持级联删除。 通过设置 `--cascade` 为 true，可以使
 
 下面是一个例子，使一个 ReplicaSet 的 Dependent 对象成为孤儿 Dependent：
 
-```Bash
+```bash
 kubectl delete replicaset my-repset --cascade=false
 ```
 
diff --git a/concepts/ingress.md b/concepts/ingress.md
index 8f26820a8..cece3224c 100644
--- a/concepts/ingress.md
+++ b/concepts/ingress.md
@@ -240,7 +240,7 @@ Ingress controller启动时附带一些适用于所有Ingress的负载平衡策
 
 假如你想要向已有的ingress中增加一个新的Host，你可以编辑和更新该ingress：
 
-```Bash
+```bash
 $ kubectl get ing
 NAME      RULE          BACKEND   ADDRESS
 test      -                       178.91.123.132
diff --git a/concepts/init-containers.md b/concepts/init-containers.md
index f39880e72..dc2ec8fc7 100644
--- a/concepts/init-containers.md
+++ b/concepts/init-containers.md
@@ -186,7 +186,7 @@ $ kubectl logs myapp-pod -c init-mydb      # Inspect the second init container
 
 一旦我们启动了 `mydb` 和 `myservice` 这两个 Service，我们能够看到 Init 容器完成，并且 `myapp-pod` 被创建：
 
-```Bash
+```bash
 $ kubectl create -f services.yaml
 service "myservice" created
 service "mydb" created
diff --git a/develop/client-go-sample.md b/develop/client-go-sample.md
index b75f6eb6c..1695cd974 100644
--- a/develop/client-go-sample.md
+++ b/develop/client-go-sample.md
@@ -16,7 +16,7 @@
 
 代码如下：
 
-```Go
+```go
 package main
 
 import (
@@ -154,7 +154,7 @@ New image -> harbor-001.jimmysong.io/library/analytics-docker-test:Build_9
 
 查看Deployment的event。
 
-```Bash
+```bash
 $ kubectl describe deployment filebeat-test   
 Name:			filebeat-test
 Namespace:		default
diff --git a/guide/authenticate-across-clusters-kubeconfig.md b/guide/authenticate-across-clusters-kubeconfig.md
index 71ddcc008..2df82d29a 100644
--- a/guide/authenticate-across-clusters-kubeconfig.md
+++ b/guide/authenticate-across-clusters-kubeconfig.md
@@ -266,7 +266,7 @@ users:
 
 #### 示例文件相关操作命令
 
-```Bash
+```bash
 $ kubectl config set preferences.colors true
 $ kubectl config set-cluster cow-cluster --server=http://cow.org:8080 --api-version=v1
 $ kubectl config set-cluster horse-cluster --server=https://horse.org:4443 --certificate-authority=path/to/my/cafile
diff --git a/guide/configure-pod-service-account.md b/guide/configure-pod-service-account.md
index 412c16753..42059a35b 100644
--- a/guide/configure-pod-service-account.md
+++ b/guide/configure-pod-service-account.md
@@ -271,7 +271,7 @@ namespace: 7 bytes
 
 然后，确认已创建。如：
 
-```Bash
+```bash
 $ kubectl get secrets myregistrykey
 NAME             TYPE                              DATA    AGE
 myregistrykey    kubernetes.io/.dockerconfigjson   1       1d
diff --git a/guide/docker-cli-to-kubectl.md b/guide/docker-cli-to-kubectl.md
index 4860b1061..a3ab60773 100644
--- a/guide/docker-cli-to-kubectl.md
+++ b/guide/docker-cli-to-kubectl.md
@@ -257,7 +257,7 @@ WARNING: No swap limit support
 
 使用 kubectl 命令：
 
-```Bash
+```bash
 $ kubectl cluster-info
 Kubernetes master is running at https://108.59.85.141
 KubeDNS is running at https://108.59.85.141/api/v1/namespaces/kube-system/services/kube-dns/proxy
diff --git a/guide/managing-tls-in-a-cluster.md b/guide/managing-tls-in-a-cluster.md
index 21c2c671b..e718d3ba6 100644
--- a/guide/managing-tls-in-a-cluster.md
+++ b/guide/managing-tls-in-a-cluster.md
@@ -22,7 +22,7 @@
 
 通过运行以下命令生成私钥和证书签名请求（或CSR）：
 
-```Bash
+```bash
 $ cat <<EOF | cfssl genkey - | cfssljson -bare server
 {
   "hosts": [
diff --git a/guide/service-access-application-cluster.md b/guide/service-access-application-cluster.md
index 93c1fef66..31a8635bd 100644
--- a/guide/service-access-application-cluster.md
+++ b/guide/service-access-application-cluster.md
@@ -27,7 +27,7 @@
 
 3. 显示 ReplicaSet 的信息：
 
-   ```
+   ```bash
    kubectl get replicasets
    kubectl describe replicasets
 
@@ -35,7 +35,7 @@
 
 4. 创建一个暴露该 Deployment 的 Service 对象：
 
-   ```Bash
+   ```bash
    kubectl expose deployment hello-world --type=NodePort --name=example-service
    ```
 
@@ -101,13 +101,13 @@
 
 要删除 Service，输入以下命令：
 
-```
+```bash
 kubectl delete services example-service
 ```
 
 删除 Deployment、ReplicaSet 和正运行在 Pod 中的 Hello World 应用程序，输入以下命令：
 
-```
+```bash
 kubectl delete deployment hello-world
 ```
 
diff --git a/practice/edge-node-configuration.md b/practice/edge-node-configuration.md
index 8d66014e1..361e3cbf8 100644
--- a/practice/edge-node-configuration.md
+++ b/practice/edge-node-configuration.md
@@ -216,7 +216,7 @@ kubectl label nodes 172.20.0.115 edgenode=true
 
 查看DaemonSet的启动情况：
 
-```Bash
+```bash
 $ kubectl -n kube-system get ds
 NAME                 DESIRED   CURRENT   READY     UP-TO-DATE   AVAILABLE   NODE-SELECTOR                              AGE
 traefik-ingress-lb   3         3         3         3            3           edgenode=true                              2h
diff --git a/practice/kubedns-addon-installation.md b/practice/kubedns-addon-installation.md
index 402f58fbd..f6472da39 100644
--- a/practice/kubedns-addon-installation.md
+++ b/practice/kubedns-addon-installation.md
@@ -38,7 +38,7 @@ kubedns-svc.yaml
 
 预定义的 RoleBinding `system:kube-dns` 将 kube-system 命名空间的 `kube-dns` ServiceAccount 与 `system:kube-dns` Role 绑定， 该 Role 具有访问 kube-apiserver DNS 相关 API 的权限；
 
-```Bash
+```bash
 $ kubectl get clusterrolebindings system:kube-dns -o yaml
 apiVersion: rbac.authorization.k8s.io/v1beta1
 kind: ClusterRoleBinding
diff --git a/practice/monitor.md b/practice/monitor.md
index 186aee2a6..c1f3c1617 100644
--- a/practice/monitor.md
+++ b/practice/monitor.md
@@ -198,7 +198,7 @@ Kubernetes中应用的监控架构如图：
 
 使用[scope.yaml](https://github.com/rootsongjc/kubernetes-handbook/blob/master/manifests/weave/scope.yaml)文件安装scope，该服务安装在`kube-system` namespace下。
 
-```Bash
+```bash
 $ kubectl apply -f scope.yaml
 ```
 
diff --git a/practice/network-and-cluster-perfermance-test.md b/practice/network-and-cluster-perfermance-test.md
index 53d6cecf9..d1ba6b2fc 100644
--- a/practice/network-and-cluster-perfermance-test.md
+++ b/practice/network-and-cluster-perfermance-test.md
@@ -29,7 +29,7 @@ Ingress Host：traefik.sample-webapp.io
 
 通过向`sample-webapp`发送curl请求获取响应时间，直接curl后的结果为：
 
-```Bash
+```bash
 $ curl "http://10.254.149.31:8000/"
 Welcome to the "Distributed Load Testing Using Kubernetes" sample web app
 ```
diff --git a/practice/storage-for-containers-using-glusterfs-with-openshift.md b/practice/storage-for-containers-using-glusterfs-with-openshift.md
index 6df225fec..240ac8eb6 100644
--- a/practice/storage-for-containers-using-glusterfs-with-openshift.md
+++ b/practice/storage-for-containers-using-glusterfs-with-openshift.md
@@ -93,7 +93,7 @@ enabled=1
 
 验证源已经被激活。
 
-```Bash
+```bash
 # yum repolist
 ```
 
@@ -357,7 +357,7 @@ State: Peer in Cluster (Connected)
 
 就像OpenShift中的其他组件一样，StorageClass也简单的用YAML文件定义：
 
-```Bash
+```bash
 # cat crs-storageclass.yaml
 kind: StorageClass
 apiVersion: storage.k8s.io/v1beta1
@@ -533,7 +533,7 @@ sh-4.2$ mysql -u $MYSQL_USER -p$MYSQL_PASSWORD -h $HOSTNAME $MYSQL_DATABASE
 
 这点很方便，所有重要的配置，如MySQL凭据，数据库名称等都是pod模板中的环境变量的一部分，因此可以在pod中作为shell的环境变量。 我们来创建一些数据：
 
-```Bash
+```bash
 mysql> show databases;
 +--------------------+
 | Database           |
diff --git a/practice/using-glusterfs-for-persistent-storage.md b/practice/using-glusterfs-for-persistent-storage.md
index e3b3d63d6..cf9c1040c 100644
--- a/practice/using-glusterfs-for-persistent-storage.md
+++ b/practice/using-glusterfs-for-persistent-storage.md
@@ -33,7 +33,7 @@ $ systemctl status glusterd.service
 
 ## 配置 glusterfs
 
-```Bash
+```bash
 # 配置 hosts
 
 $ vi /etc/hosts
@@ -268,7 +268,7 @@ PVC属性
 
 ## 配置PVC
 
-```Bash
+```bash
 $ cat glusterfs-pvc.yaml
 kind: PersistentVolumeClaim
 apiVersion: v1
@@ -293,7 +293,7 @@ glusterfs-nginx   Bound     gluster-dev-volume   8Gi        RWX
 
 ## 创建 nginx deployment 挂载 volume
 
-```Bash
+```bash
 $ vi nginx-deployment.yaml
 apiVersion: extensions/v1beta1 
 kind: Deployment