diff --git a/shadowsocks/Dockerfile b/shadowsocks/Dockerfile
index 424af9a..7798cd4 100644
--- a/shadowsocks/Dockerfile
+++ b/shadowsocks/Dockerfile
@@ -22,7 +22,7 @@ EXPOSE $SERVER_PORT
 
 CMD ssserver -s $SERVER_ADDR \
              -p $SERVER_PORT \
-             -k ${PASSWORD:-$(head -c 6 /dev/urandom | base64)} \
+             -k ${PASSWORD:-$(hostname)} \
              -m $METHOD \
              -t $TIMEOUT \
              --fast-open \
diff --git a/shadowsocks/libev/Dockerfile b/shadowsocks/libev/Dockerfile
index 288ef5e..ad2bfcc 100644
--- a/shadowsocks/libev/Dockerfile
+++ b/shadowsocks/libev/Dockerfile
@@ -31,7 +31,7 @@ EXPOSE $SERVER_PORT
 
 CMD ss-server -s $SERVER_ADDR \
               -p $SERVER_PORT \
-              -k ${PASSWORD:-$(head -c 6 /dev/urandom | base64)} \
+              -k ${PASSWORD:-$(hostname)} \
               -m $METHOD \
               -t $TIMEOUT \
               --fast-open \