update zookeeper address (#16)

diff --git a/dubbo-admin-book-en/install/zookeeper.md b/dubbo-admin-book-en/install/zookeeper.md
index 7d6720d..a1fb924 100644
--- a/dubbo-admin-book-en/install/zookeeper.md
+++ b/dubbo-admin-book-en/install/zookeeper.md
@@ -7,7 +7,7 @@
 install:
 
 ```sh
-wget http://www.apache.org/dist//zookeeper/zookeeper-3.3.3/zookeeper-3.3.3.tar.gz
+wget http://archive.apache.org/dist/zookeeper/zookeeper-3.3.3/zookeeper-3.3.3.tar.gz
 tar zxvf zookeeper-3.3.3.tar.gz
 cd zookeeper-3.3.3
 cp conf/zoo_sample.cfg conf/zoo.cfg
@@ -95,4 +95,4 @@
 [^2]: Data directory should be changed into your real output directory
 [^3]: Data directory and server address should be changed into your real machine information
 [^4]: `dataDir` in `zoo.cfg`
-[^5]: http://zookeeper.apache.org/doc/r3.3.3/zookeeperAdmin.html
\ No newline at end of file
+[^5]: http://zookeeper.apache.org/doc/r3.3.3/zookeeperAdmin.html
diff --git a/dubbo-admin-book/install/zookeeper.md b/dubbo-admin-book/install/zookeeper.md
index 5865472..1cafbf8 100644
--- a/dubbo-admin-book/install/zookeeper.md
+++ b/dubbo-admin-book/install/zookeeper.md
@@ -7,7 +7,7 @@
 安装:
 
 ```sh
-wget http://www.apache.org/dist//zookeeper/zookeeper-3.3.3/zookeeper-3.3.3.tar.gz
+wget http://archive.apache.org/dist/zookeeper/zookeeper-3.3.3/zookeeper-3.3.3.tar.gz
 tar zxvf zookeeper-3.3.3.tar.gz
 cd zookeeper-3.3.3
 cp conf/zoo_sample.cfg conf/zoo.cfg
@@ -95,4 +95,4 @@
 [^2]: 其中 data 目录需改成你真实输出目录
 [^3]: 其中 data 目录和 server 地址需改成你真实部署机器的信息
 [^4]: 上面 `zoo.cfg` 中的 `dataDir`
-[^5]: http://zookeeper.apache.org/doc/r3.3.3/zookeeperAdmin.html
\ No newline at end of file
+[^5]: http://zookeeper.apache.org/doc/r3.3.3/zookeeperAdmin.html