- upgraded to centos 6.10

deploy_checkit_tiff/Dockerfile

-FROM centos:6.9
+FROM centos:6.10
 MAINTAINER Andreas Romeyke <romeyke@slub-dresden.de>
 # current could be 0.3.1 or 0.4.0, because 0.4.0 is bugfixed version of
 # checkit_tiff with rules compatible to 0.3.1 based on Handreichung TIFF v1.2
@@ -26,16 +26,21 @@ ENV PATCH="\
 
 
 # based on https://hub.docker.com/r/rpmbuild/centos6/
+## next steps needed because deprecated certificates
+RUN yum clean all -y
+RUN yum check -y
+RUN yum update ca-certificates -y
+RUN yum upgrade -y
+
 ## install base environment
-RUN yum install -y \
-                   libtool libtool-ltdl \
-                   make cmake \
-                   pkgconfig \
-                   sudo \
-                   automake autoconf \
-                   wget \
-                   yum-utils rpm-build && \
-    yum clean all
+RUN yum install -v -y libtool
+RUN yum install -v -y libtool-ltdl
+RUN yum install -v -y make cmake 
+RUN yum install -v -y pkgconfig 
+RUN yum install -v -y sudo 
+RUN yum install -v -y automake autoconf 
+RUN yum install -v -y wget 
+RUN yum install -v -y yum-utils rpm-build 
 RUN wget http://people.centos.org/tru/devtools-2/devtools-2.repo -O /etc/yum.repos.d/devtools-2.repo
 # git [devtools-2] (1.8.4) for "rev-list --count" feature, git [centos6] (1.7.1) too old
 RUN yum install -y devtoolset-2-git