diff --git a/README.md b/README.md
new file mode 100644
index 0000000..25e76c4
--- /dev/null
+++ b/README.md
@@ -0,0 +1,8 @@
+# jekins slaves
+
+## build
+
+```
+docker build --pull=true -t pgollor/jenkins-slave ./docker/main/
+docker build --pull=true -t pgollor/jenkins-slave-arduino ./docker/arduino/
+```
diff --git a/docker-compose.yml b/docker-compose.yml
index 7bae31f..97592aa 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -8,7 +8,7 @@
       environment:
         - JENKINS_SLAVE_SSH_PUBKEY=${JENKINS_SLAVE_SSH_PUBKEY}
       volumes:
-        - ./data/slave1:/home/jenkins/
+        - ./data/slave1/:/home/jenkins/
       tmpfs:
         - /tmp:rw
         - /run:rw,size=64m
@@ -23,7 +23,7 @@
       environment:
         - JENKINS_SLAVE_SSH_PUBKEY=${JENKINS_SLAVE_SSH_PUBKEY}
       volumes:
-        - ./data/slave2:/home/jenkins/
+        - ./data/slave2/:/home/jenkins/
       tmpfs:
         - /tmp:rw
         - /run:rw,size=64m
diff --git a/docker/arduino/Dockerfile b/docker/arduino/Dockerfile
index 2fb66df..6bb8d72 100644
--- a/docker/arduino/Dockerfile
+++ b/docker/arduino/Dockerfile
@@ -1,10 +1,20 @@
 FROM pgollor/jenkins-slave
 LABEL MAINTAINER="Pascal Gollor <kalle@pgollor.de>"
 
+# install new ssh key
+RUN rm /etc/ssh/ssh_host_rsa_key* /etc/ssh/ssh_host_dsa_key*
+RUN ssh-keygen -f /etc/ssh/ssh_host_rsa_key -N '' -t rsa
+RUN ssh-keygen -f /etc/ssh/ssh_host_dsa_key -N '' -t dsa
+
 # install arduino
 RUN ( \
 	wget -O arduino.tar.xz https://www.arduino.cc/download.php?f=/arduino-nightly-linux64.tar.xz \
-	&& tar xf arduino.tar.xz \
-	&& mv arduino-nightly arduino \
-	&& export PATH="$PWD/arduino:$PATH" \
-	)
+	&& tar -xC /srv -f arduino.tar.xz \
+	&& rm arduino.tar.xz)
+RUN mv /srv/arduino-nightly /srv/arduino
+RUN ln -s /srv/arduino/arduino /usr/local/bin
+RUN ln -s /srv/arduino/arduino-builder /usr/local/bin
+
+ENV ARDUINO /srv/arduino
+
+ENTRYPOINT ["setup-sshd"]
diff --git a/docker/main/Dockerfile b/docker/main/Dockerfile
index 5bbd2cf..39199f5 100644
--- a/docker/main/Dockerfile
+++ b/docker/main/Dockerfile
@@ -5,3 +5,10 @@
 RUN apt-get -y update \
 	&& apt-get -y upgrade \
 	&& rm -rf /var/lib/apt/lists/*
+
+# install new ssh key
+RUN rm /etc/ssh/ssh_host_rsa_key* /etc/ssh/ssh_host_dsa_key*
+RUN ssh-keygen -f /etc/ssh/ssh_host_rsa_key -N '' -t rsa
+RUN ssh-keygen -f /etc/ssh/ssh_host_dsa_key -N '' -t dsa
+
+ENTRYPOINT ["setup-sshd"]