diff --git a/gmi/docker/Dockerfile b/gmi/docker/Dockerfile
index 6ffe405..6789bdb 100644
--- a/gmi/docker/Dockerfile
+++ b/gmi/docker/Dockerfile
@@ -2,12 +2,20 @@ FROM alpine:latest
 
 RUN sed -i 's/dl-cdn.alpinelinux.org/mirrors.tuna.tsinghua.edu.cn/g' /etc/apk/repositories \
     && sed -i 'a https://mirrors.tuna.tsinghua.edu.cn/alpine/edge/testing' /etc/apk/repositories \
-    && apk add agate git
+    && apk add agate git \
+    && touch /var/log/git.log
 
 RUN git clone https://github.com/dongdigua/dongdigua.github.io.git --depth 1
 
 COPY run-wrapper.sh .
+# https://weinan.io/2019/04/06/cron.html
 COPY update-git.sh /etc/periotic/daily/
 
+# for testing purpose only
+# RUN mkdir /etc/periodic/1min \
+#     && echo "*/1  *  *  *  *  run-parts /etc/periodic/1min" \
+#     >> /var/spool/cron/crontabs/root
+# COPY update-git.sh /etc/periodic/1min/
+
 
 CMD [ "./run-wrapper.sh" ]
diff --git a/gmi/docker/run-wrapper.sh b/gmi/docker/run-wrapper.sh
index 838fcdd..01abaf0 100755
--- a/gmi/docker/run-wrapper.sh
+++ b/gmi/docker/run-wrapper.sh
@@ -1,7 +1,8 @@
 #! /bin/sh
 
-crond -f &
-agate --content dongdigua.github.io/gmi --hostname $GEMINI_HOST 
+crond -f -d 8 &
+tail -f /var/log/git.log &
+agate --content dongdigua.github.io/gmi -e --hostname $GEMINI_HOST
 
 wait -n
 echo $?
diff --git a/gmi/docker/update-git.sh b/gmi/docker/update-git.sh
index 234bc81..16cc912 100755
--- a/gmi/docker/update-git.sh
+++ b/gmi/docker/update-git.sh
@@ -1,4 +1,4 @@
 #! /bin/sh
 
-cd dongdigua.github.io
-git pull --rebase
+cd /dongdigua.github.io
+git pull --rebase >> /var/log/git.log 2>&1