diff --git a/ELK.sh b/ELK.sh
index 31486c3..cad64ba 100755
--- a/ELK.sh
+++ b/ELK.sh
@@ -22,7 +22,9 @@ declare -A REPO_VERSIONS=(
 mkdir -p ${YUM_PATH} ${APT_PATH}
 
 # =================== APT repos ===============================
-# export APT_DRY_RUN=1
+if [[ ! -z ${DRY_RUN:-} ]]; then
+	export APT_DRY_RUN=1
+fi
  
 for repo in "${!REPO_VERSIONS[@]}"; do
 	# magic here, don't quote ${REPO_VERSIONS[$repo][@]}
@@ -64,9 +66,12 @@ EOF
 done
 done
 
-reposync -c $cfg -d -p ${YUM_PATH} -e ${cache_dir}
-for repo in "${!REPO_VERSIONS[@]}"; do
-	for version in ${REPO_VERSIONS[$repo]}; do
-		createrepo --update -v -c ${cache_dir} -o ${YUM_PATH}/${repo}-${version}/ ${YUM_PATH}/${repo}-${version}/
+if [[ -z ${DRY_RUN:-} ]]; then
+	reposync -c $cfg -d -p ${YUM_PATH} -e ${cache_dir}
+	for repo in "${!REPO_VERSIONS[@]}"; do
+		for version in ${REPO_VERSIONS[$repo]}; do
+			createrepo --update -v -c ${cache_dir} -o ${YUM_PATH}/${repo}-${version}/ ${YUM_PATH}/${repo}-${version}/
+		done
 	done
-done
+fi
+rm $cfg
diff --git a/docker.sh b/docker.sh
index 4b23475..f9ca34e 100755
--- a/docker.sh
+++ b/docker.sh
@@ -43,12 +43,18 @@ EOF
 
 [ ! -d ${YUM_PATH}/centos6 ] && mkdir -p ${YUM_PATH}/centos6
 [ ! -d ${YUM_PATH}/centos7 ] && mkdir -p ${YUM_PATH}/centos7
-reposync -c $cfg -d -p ${YUM_PATH}  -e $cache_dir
-createrepo --update -v -c $cache_dir -o ${YUM_PATH}/centos6 ${YUM_PATH}/centos7
-createrepo --update -v -c $cache_dir -o ${YUM_PATH}/centos7 ${YUM_PATH}/centos7
+
+if [[ -z ${DRY_RUN:-} ]]; then
+	reposync -c $cfg -d -p ${YUM_PATH}  -e $cache_dir
+	createrepo --update -v -c $cache_dir -o ${YUM_PATH}/centos6 ${YUM_PATH}/centos7
+	createrepo --update -v -c $cache_dir -o ${YUM_PATH}/centos7 ${YUM_PATH}/centos7
+fi
 rm $cfg
 
 # APT mirror 
+if [[ ! -z ${DRY_RUN:-} ]]; then
+	export APT_DRY_RUN=1
+fi
 base_url="https://apt.dockerproject.org/repo"
 for version in ${APT_VERSIONS[@]}; do
 	apt-download-binary ${base_url} "$version" "main" "amd64" "${APT_PATH}" || true
diff --git a/gitlab-ce.sh b/gitlab-ce.sh
index b8de321..da62234 100755
--- a/gitlab-ce.sh
+++ b/gitlab-ce.sh
@@ -43,11 +43,17 @@ gpgkey=https://packages.gitlab.com/gpg.key
 sslverify=0
 EOF
 
-reposync -c $cfg -d -p ${YUM_PATH} -e $cache_dir
-createrepo --update -v -c $cache_dir -o ${YUM_PATH}/el6 ${YUM_PATH}/el6
-createrepo --update -v -c $cache_dir -o ${YUM_PATH}/el7 ${YUM_PATH}/el7
+if [[ -z ${DRY_RUN:-} ]]; then
+	reposync -c $cfg -d -p ${YUM_PATH} -e $cache_dir
+	createrepo --update -v -c $cache_dir -o ${YUM_PATH}/el6 ${YUM_PATH}/el6
+	createrepo --update -v -c $cache_dir -o ${YUM_PATH}/el7 ${YUM_PATH}/el7
+fi
 rm $cfg
 
+if [[ ! -z ${DRY_RUN:-} ]]; then
+	export APT_DRY_RUN=1
+fi
+
 base_url="https://packages.gitlab.com/gitlab/gitlab-ce/ubuntu"
 for version in ${UBUNTU_VERSIONS[@]}; do
 	apt-download-binary ${base_url} "$version" "main" "amd64" "${UBUNTU_PATH}" || true
diff --git a/gitlab-ci-multi-runner.sh b/gitlab-ci-multi-runner.sh
index 5c32569..1797657 100755
--- a/gitlab-ci-multi-runner.sh
+++ b/gitlab-ci-multi-runner.sh
@@ -44,13 +44,19 @@ gpgkey=https://packages.gitlab.com/gpg.key
 sslverify=0
 EOF
 
-reposync -c $cfg -d -p ${YUM_PATH}  -e $cache_dir
-[ ! -d ${YUM_PATH}/el6 ] && mkdir -p ${YUM_PATH}/el6
-[ ! -d ${YUM_PATH}/el7 ] && mkdir -p ${YUM_PATH}/el7
-createrepo --update -v -c $cache_dir -o ${YUM_PATH}/el6 ${YUM_PATH}/el6
-createrepo --update -v -c $cache_dir -o ${YUM_PATH}/el7 ${YUM_PATH}/el7
+if [[ -z ${DRY_RUN:-} ]]; then
+	reposync -c $cfg -d -p ${YUM_PATH}  -e $cache_dir
+	[ ! -d ${YUM_PATH}/el6 ] && mkdir -p ${YUM_PATH}/el6
+	[ ! -d ${YUM_PATH}/el7 ] && mkdir -p ${YUM_PATH}/el7
+	createrepo --update -v -c $cache_dir -o ${YUM_PATH}/el6 ${YUM_PATH}/el6
+	createrepo --update -v -c $cache_dir -o ${YUM_PATH}/el7 ${YUM_PATH}/el7
+fi
 rm $cfg
 
+if [[ ! -z ${DRY_RUN:-} ]]; then
+	export APT_DRY_RUN=1
+fi
+
 base_url="https://packages.gitlab.com/runner/gitlab-ci-multi-runner/ubuntu"
 for version in ${UBUNTU_VERSIONS[@]}; do
 	apt-download-binary ${base_url} "$version" "main" "amd64" "${UBUNTU_PATH}" || true
diff --git a/grafana.sh b/grafana.sh
index 719e86b..afb6b50 100755
--- a/grafana.sh
+++ b/grafana.sh
@@ -21,7 +21,9 @@ mkdir -p ${YUM_PATH} ${APT_PATH}
 
 
 # =================== APT repos ===============================
-# export APT_DRY_RUN=0
+if [[ ! -z ${DRY_RUN:-} ]]; then
+	export APT_DRY_RUN=1
+fi
 base_url="${BASE_URL}/debian"
 for version in ${APT_VERSIONS[@]}; do
 	for arch in "amd64" "i386"; do
@@ -50,7 +52,10 @@ enabled=1
 EOF
 done
 
-reposync -c $cfg -d -p ${YUM_PATH} -e $cache_dir
-for elver in ${EL_VERSIONS[@]}; do
-	createrepo --update -v -c $cache_dir -o ${YUM_PATH}/el${elver}/ ${YUM_PATH}/el${elver}/
-done
+if [[ -z ${DRY_RUN:-} ]]; then
+	reposync -c $cfg -d -p ${YUM_PATH} -e $cache_dir
+	for elver in ${EL_VERSIONS[@]}; do
+		createrepo --update -v -c $cache_dir -o ${YUM_PATH}/el${elver}/ ${YUM_PATH}/el${elver}/
+	done
+fi
+rm $cfg
diff --git a/influxdata.sh b/influxdata.sh
index 1e815ec..c1549f9 100755
--- a/influxdata.sh
+++ b/influxdata.sh
@@ -24,7 +24,9 @@ mkdir -p ${YUM_PATH} ${UBUNTU_PATH} ${DEBIAN_PATH}
 wget -O ${BASE_PATH}/influxdb.key ${BASE_URL}/influxdb.key
 
 # =================== APT repos ===============================
-# export APT_DRY_RUN=0
+if [[ ! -z ${DRY_RUN:-} ]]; then
+	export APT_DRY_RUN=1
+fi
 base_url="${BASE_URL}/ubuntu"
 for version in ${UBUNTU_VERSIONS[@]}; do
 	for arch in "amd64" "i386" "armhf" "arm64"; do
@@ -61,7 +63,10 @@ enabled=1
 EOF
 done
 
-reposync -c $cfg -d -p ${YUM_PATH} -e $cache_dir
-for elver in ${EL_VERSIONS[@]}; do
-	createrepo --update -v -c $cache_dir -o ${YUM_PATH}/el${elver}-x86_64/ ${YUM_PATH}/el${elver}-x86_64/
-done
+if [[ -z ${DRY_RUN:-} ]]; then
+	reposync -c $cfg -d -p ${YUM_PATH} -e $cache_dir
+	for elver in ${EL_VERSIONS[@]}; do
+		createrepo --update -v -c $cache_dir -o ${YUM_PATH}/el${elver}-x86_64/ ${YUM_PATH}/el${elver}-x86_64/
+	done
+fi
+rm $cfg
diff --git a/mongodb.sh b/mongodb.sh
index 1260527..98059ed 100755
--- a/mongodb.sh
+++ b/mongodb.sh
@@ -49,17 +49,24 @@ sslverify=0
 EOF
 done
 
-reposync -c $cfg -d -p ${YUM_PATH} -e $cache_dir
-for mgver in ${MONGO_VERSIONS[@]}; do
-	createrepo --update -v -c $cache_dir -o ${YUM_PATH}/el6-$mgver/ ${YUM_PATH}/el6-$mgver/
-	createrepo --update -v -c $cache_dir -o ${YUM_PATH}/el7-$mgver/ ${YUM_PATH}/el7-$mgver/
-done
+if [[ -z ${DRY_RUN:-} ]]; then
+	reposync -c $cfg -d -p ${YUM_PATH} -e $cache_dir
+	for mgver in ${MONGO_VERSIONS[@]}; do
+		createrepo --update -v -c $cache_dir -o ${YUM_PATH}/el6-$mgver/ ${YUM_PATH}/el6-$mgver/
+		createrepo --update -v -c $cache_dir -o ${YUM_PATH}/el7-$mgver/ ${YUM_PATH}/el7-$mgver/
+	done
+fi
 
 [ -e ${YUM_PATH}/el6 ] || (cd ${YUM_PATH}; ln -s el6-${STABLE_VERSION} el6)
 [ -e ${YUM_PATH}/el7 ] || (cd ${YUM_PATH}; ln -s el7-${STABLE_VERSION} el7)
 
 rm $cfg
 
+
+if [[ ! -z ${DRY_RUN:-} ]]; then
+	export APT_DRY_RUN=1
+fi
+
 base_url="http://repo.mongodb.org/apt/ubuntu"
 for ubver in ${UBUNTU_VERSIONS[@]}; do
 	for mgver in ${MONGO_VERSIONS[@]}; do
diff --git a/mysql.sh b/mysql.sh
index 6d9aead..48d07af 100755
--- a/mysql.sh
+++ b/mysql.sh
@@ -32,7 +32,9 @@ mkdir -p ${YUM_PATH} ${UBUNTU_PATH} ${DEBIAN_PATH}
 
 
 # =================== APT repos ===============================
-# export APT_DRY_RUN=0
+if [[ ! -z ${DRY_RUN:-} ]]; then
+	export APT_DRY_RUN=1
+fi
 MYSQL_APT_REPOS=("mysql-5.6" "mysql-5.7" "mysql-tools" "connector-python-2.1")
  
 base_url="${BASE_URL}/apt/ubuntu"
@@ -91,13 +93,18 @@ enabled=1
 EOF
 done
 
-reposync -c $cfg -d -p ${YUM_PATH} -e $cache_dir
-for repo in "mysql-connectors-community" "mysql-tools-community" "mysql56-community" "mysql57-community"; do
-	for elver in "6" "7"; do
-		createrepo --update -v -c $cache_dir -o ${YUM_PATH}/${repo}-el${elver}/ ${YUM_PATH}/${repo}-el${elver}/
+if [[ -z ${DRY_RUN:-} ]]; then
+	reposync -c $cfg -d -p ${YUM_PATH} -e $cache_dir
+	for repo in "mysql-connectors-community" "mysql-tools-community" "mysql56-community" "mysql57-community"; do
+		for elver in "6" "7"; do
+			createrepo --update -v -c $cache_dir -o ${YUM_PATH}/${repo}-el${elver}/ ${YUM_PATH}/${repo}-el${elver}/
+		done
 	done
-done
+fi
+rm $cfg
 
 # --------- dev.mysql.com --------
 
-rsync ${RSYNC_OPTS} "${MYSQL_RSYNC_UPSTREAM}" "${MYSQL_DOWNLOAD_PATH}"
+if [[ -z ${DRY_RUN:-} ]]; then
+	rsync ${RSYNC_OPTS} "${MYSQL_RSYNC_UPSTREAM}" "${MYSQL_DOWNLOAD_PATH}"
+fi
diff --git a/percona.sh b/percona.sh
index 9701ee2..f20b6bf 100755
--- a/percona.sh
+++ b/percona.sh
@@ -21,7 +21,9 @@ mkdir -p ${YUM_PATH} ${APT_PATH}
 
 
 # =================== APT repos ===============================
-# export APT_DRY_RUN=0
+if [[ ! -z ${DRY_RUN:-} ]]; then
+	export APT_DRY_RUN=1
+fi
 base_url="${BASE_URL}/apt"
 for version in ${APT_VERSIONS[@]}; do
 	for arch in "amd64" "i386"; do
@@ -49,7 +51,10 @@ enabled=1
 EOF
 done
 
-reposync -c $cfg -d -p ${YUM_PATH} -e $cache_dir
-for elver in ${EL_VERSIONS[@]}; do
-	createrepo --update -v -c $cache_dir -o ${YUM_PATH}/el${elver}/ ${YUM_PATH}/el${elver}/
-done
+if [[ -z ${DRY_RUN:-} ]]; then
+	reposync -c $cfg -d -p ${YUM_PATH} -e $cache_dir
+	for elver in ${EL_VERSIONS[@]}; do
+		createrepo --update -v -c $cache_dir -o ${YUM_PATH}/el${elver}/ ${YUM_PATH}/el${elver}/
+	done
+fi
+rm $cfg