diff --git a/Dockerfile b/Dockerfile
index 76c7c02..3e06196 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -79,6 +79,12 @@ RUN /script/install_zsh531.sh
 ADD install_ninja172.sh /script/
 RUN /script/install_ninja172.sh
 
+# set timezone
+RUN ln -snf /usr/share/zoneinfo/Asia/Seoul /etc/localtime
+
+# ctail
+RUN wget -O - https://raw.githubusercontent.com/castisdev/ctail/master/install.sh --no-check-certificate | bash
+
 # Add root files
 ADD .bashrc /root/.bashrc