diff --git a/.docker/Dockerfile b/.docker/Dockerfile
index 44192be8705bdc2d53fb1521d3758b8b412836d9..603ec470defad37cf94a88dcc32b16e6270de350 100644
--- a/.docker/Dockerfile
+++ b/.docker/Dockerfile
@@ -6,6 +6,6 @@ COPY .docker/wait-for-it.sh /wait-for-it.sh
 RUN git clone https://gitlab.gwdg.de/bmp-caosdb/caosdb-pylib.git && \
    cd caosdb-pylib && pip3 install .
 COPY . /git
-RUN rm -r /git/.git && mv /git/.docker/.pycaosdb.ini /git && mv /git/.docker/cert /opt/caosdb/cert
+RUN rm -r /git/.git && mv /git/.docker/.pycaosdb.ini /git 
 WORKDIR /git
 CMD /wait-for-it.sh caosdb-server:10443 -t 120 -- tox 
diff --git a/.docker/docker-compose.yml b/.docker/docker-compose.yml
index 9d4c72e93ce8ca44ad9f7e0213722122e215efcf..81bc32d64e3b920c73107641c4e6ca2ca14012bd 100644
--- a/.docker/docker-compose.yml
+++ b/.docker/docker-compose.yml
@@ -12,6 +12,10 @@ services:
       - sqldb
     networks:
       - caosnet
+    volumes:
+      - type: bind
+        source: ".docker/cert"
+        target: /opt/caosdb/cert
     ports:
       # - "from_outside:from_inside"
       - "10443:10443"
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 5092166ac0504948e0575c56c63ffda57b4d2134..464a1cf53200fceaa96cc8fe7e028487aba53a52 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -64,7 +64,6 @@ test:
       - docker login -u testuser -p $CI_REGISTRY_PASSWORD $CI_REGISTRY
       - cd .docker
       - CAOSDB_TAG=$CAOSDB_TAG docker-compose  up -d
-      - docker cp -a docker_caosdb-server_1:/opt/caosdb/cert/ cert
       - docker-compose -f tester.yml run tester 
       - rc=$?
       - docker-compose  down