diff --git a/lib/databases/mysql b/lib/databases/mysql
index 0ccfce5..67bf85a 100644
--- a/lib/databases/mysql
+++ b/lib/databases/mysql
@@ -47,22 +47,22 @@
 }
 
 function configure_database_mysql {
-    local slow_log
+    local my_conf mysql slow_log
     echo_summary "Configuring and starting MySQL"
 
     if is_ubuntu; then
-        MY_CONF=/etc/mysql/my.cnf
-        MYSQL=mysql
+        my_conf=/etc/mysql/my.cnf
+        mysql=mysql
     elif is_fedora; then
         if [[ $DISTRO =~ (rhel7) ]]; then
-            MYSQL=mariadb
+            mysql=mariadb
         else
-            MYSQL=mysqld
+            mysql=mysqld
         fi
-        MY_CONF=/etc/my.cnf
+        my_conf=/etc/my.cnf
     elif is_suse; then
-        MY_CONF=/etc/my.cnf
-        MYSQL=mysql
+        my_conf=/etc/my.cnf
+        mysql=mysql
     else
         exit_distro_not_supported "mysql configuration"
     fi
@@ -70,7 +70,7 @@
     # Start mysql-server
     if is_fedora || is_suse; then
         # service is not started by default
-        start_service $MYSQL
+        start_service $mysql
     fi
 
     # Set the root password - only works the first time. For Ubuntu, we already
@@ -87,9 +87,9 @@
     # Change ‘bind-address’ from localhost (127.0.0.1) to any (0.0.0.0) and
     # set default db type to InnoDB
     sudo bash -c "source $TOP_DIR/functions && \
-        iniset $MY_CONF mysqld bind-address 0.0.0.0 && \
-        iniset $MY_CONF mysqld sql_mode STRICT_ALL_TABLES && \
-        iniset $MY_CONF mysqld default-storage-engine InnoDB"
+        iniset $my_conf mysqld bind-address 0.0.0.0 && \
+        iniset $my_conf mysqld sql_mode STRICT_ALL_TABLES && \
+        iniset $my_conf mysqld default-storage-engine InnoDB"
 
 
     if [[ "$DATABASE_QUERY_LOGGING" == "True" ]]; then
@@ -102,19 +102,19 @@
         sudo sed -e '/log.slow.queries/d' \
             -e '/long.query.time/d' \
             -e '/log.queries.not.using.indexes/d' \
-            -i $MY_CONF
+            -i $my_conf
 
         # Turn on slow query log, log all queries (any query taking longer than
         # 0 seconds) and log all non-indexed queries
         sudo bash -c "source $TOP_DIR/functions && \
-            iniset $MY_CONF mysqld slow-query-log 1 && \
-            iniset $MY_CONF mysqld slow-query-log-file $slow_log && \
-            iniset $MY_CONF mysqld long-query-time 0 && \
-            iniset $MY_CONF mysqld log-queries-not-using-indexes 1"
+            iniset $my_conf mysqld slow-query-log 1 && \
+            iniset $my_conf mysqld slow-query-log-file $slow_log && \
+            iniset $my_conf mysqld long-query-time 0 && \
+            iniset $my_conf mysqld log-queries-not-using-indexes 1"
 
     fi
 
-    restart_service $MYSQL
+    restart_service $mysql
 }
 
 function install_database_mysql {
diff --git a/lib/databases/postgresql b/lib/databases/postgresql
index 6e85d6e..fb6d304 100644
--- a/lib/databases/postgresql
+++ b/lib/databases/postgresql
@@ -42,11 +42,12 @@
 }
 
 function configure_database_postgresql {
+    local pg_conf pg_dir pg_hba root_roles
     echo_summary "Configuring and starting PostgreSQL"
     if is_fedora; then
-        PG_HBA=/var/lib/pgsql/data/pg_hba.conf
-        PG_CONF=/var/lib/pgsql/data/postgresql.conf
-        if ! sudo [ -e $PG_HBA ]; then
+        pg_hba=/var/lib/pgsql/data/pg_hba.conf
+        pg_conf=/var/lib/pgsql/data/postgresql.conf
+        if ! sudo [ -e $pg_hba ]; then
             if ! [[ $DISTRO =~ (rhel6) ]]; then
                 sudo postgresql-setup initdb
             else
@@ -54,25 +55,25 @@
             fi
         fi
     elif is_ubuntu; then
-        PG_DIR=`find /etc/postgresql -name pg_hba.conf|xargs dirname`
-        PG_HBA=$PG_DIR/pg_hba.conf
-        PG_CONF=$PG_DIR/postgresql.conf
+        pg_dir=`find /etc/postgresql -name pg_hba.conf|xargs dirname`
+        pg_hba=$pg_dir/pg_hba.conf
+        pg_conf=$pg_dir/postgresql.conf
     elif is_suse; then
-        PG_HBA=/var/lib/pgsql/data/pg_hba.conf
-        PG_CONF=/var/lib/pgsql/data/postgresql.conf
+        pg_hba=/var/lib/pgsql/data/pg_hba.conf
+        pg_conf=/var/lib/pgsql/data/postgresql.conf
         # initdb is called when postgresql is first started
-        sudo [ -e $PG_HBA ] || start_service postgresql
+        sudo [ -e $pg_hba ] || start_service postgresql
     else
         exit_distro_not_supported "postgresql configuration"
     fi
     # Listen on all addresses
-    sudo sed -i "/listen_addresses/s/.*/listen_addresses = '*'/" $PG_CONF
+    sudo sed -i "/listen_addresses/s/.*/listen_addresses = '*'/" $pg_conf
     # Set max_connections
-    sudo sed -i "/max_connections/s/.*/max_connections = $MAX_DB_CONNECTIONS/" $PG_CONF
+    sudo sed -i "/max_connections/s/.*/max_connections = $MAX_DB_CONNECTIONS/" $pg_conf
     # Do password auth from all IPv4 clients
-    sudo sed -i "/^host/s/all\s\+127.0.0.1\/32\s\+ident/$DATABASE_USER\t0.0.0.0\/0\tpassword/" $PG_HBA
+    sudo sed -i "/^host/s/all\s\+127.0.0.1\/32\s\+ident/$DATABASE_USER\t0.0.0.0\/0\tpassword/" $pg_hba
     # Do password auth for all IPv6 clients
-    sudo sed -i "/^host/s/all\s\+::1\/128\s\+ident/$DATABASE_USER\t::0\/0\tpassword/" $PG_HBA
+    sudo sed -i "/^host/s/all\s\+::1\/128\s\+ident/$DATABASE_USER\t::0\/0\tpassword/" $pg_hba
     restart_service postgresql
 
     # Create the role if it's not here or else alter it.
@@ -86,14 +87,14 @@
 
 function install_database_postgresql {
     echo_summary "Installing postgresql"
-    PGPASS=$HOME/.pgpass
-    if [[ ! -e $PGPASS ]]; then
-        cat <<EOF > $PGPASS
+    local pgpass=$HOME/.pgpass
+    if [[ ! -e $pgpass ]]; then
+        cat <<EOF > $pgpass
 *:*:*:$DATABASE_USER:$DATABASE_PASSWORD
 EOF
-        chmod 0600 $PGPASS
+        chmod 0600 $pgpass
     else
-        sed -i "s/:root:\w\+/:root:$DATABASE_PASSWORD/" $PGPASS
+        sed -i "s/:root:\w\+/:root:$DATABASE_PASSWORD/" $pgpass
     fi
     if is_ubuntu; then
         install_package postgresql
diff --git a/lib/rpc_backend b/lib/rpc_backend
index a62d4e7..38da50c 100644
--- a/lib/rpc_backend
+++ b/lib/rpc_backend
@@ -26,6 +26,8 @@
 # Make sure we only have one rpc backend enabled.
 # Also check the specified rpc backend is available on your platform.
 function check_rpc_backend {
+    local c svc
+
     local rpc_needed=1
     # We rely on the fact that filenames in lib/* match the service names
     # that can be passed as arguments to is_service_enabled.
@@ -138,6 +140,7 @@
         # NOTE(bnemec): Retry initial rabbitmq configuration to deal with
         # the fact that sometimes it fails to start properly.
         # Reference: https://bugzilla.redhat.com/show_bug.cgi?id=1059028
+        local i
         for i in `seq 10`; do
             if is_fedora || is_suse; then
                 # service is not started by default