diff --git a/functions-common b/functions-common
index b0b262236d..23d59c7d98 100644
--- a/functions-common
+++ b/functions-common
@@ -1244,8 +1244,8 @@ function _run_process {
     exec 6>&-
 
     if [[ -n ${SCREEN_LOGDIR} ]]; then
-        exec 1>&${SCREEN_LOGDIR}/screen-${service}.${CURRENT_LOG_TIME}.log 2>&1
-        ln -sf ${SCREEN_LOGDIR}/screen-${service}.${CURRENT_LOG_TIME}.log ${SCREEN_LOGDIR}/screen-${service}.log
+        exec 1>&${SCREEN_LOGDIR}/screen-${service}.log.${CURRENT_LOG_TIME} 2>&1
+        ln -sf ${SCREEN_LOGDIR}/screen-${service}.log.${CURRENT_LOG_TIME} ${SCREEN_LOGDIR}/screen-${service}.log
 
         # TODO(dtroyer): Hack to get stdout from the Python interpreter for the logs.
         export PYTHONUNBUFFERED=1
@@ -1329,9 +1329,9 @@ function screen_process {
     screen -S $SCREEN_NAME -X screen -t $name
 
     if [[ -n ${SCREEN_LOGDIR} ]]; then
-        screen -S $SCREEN_NAME -p $name -X logfile ${SCREEN_LOGDIR}/screen-${name}.${CURRENT_LOG_TIME}.log
+        screen -S $SCREEN_NAME -p $name -X logfile ${SCREEN_LOGDIR}/screen-${name}.log.${CURRENT_LOG_TIME}
         screen -S $SCREEN_NAME -p $name -X log on
-        ln -sf ${SCREEN_LOGDIR}/screen-${name}.${CURRENT_LOG_TIME}.log ${SCREEN_LOGDIR}/screen-${name}.log
+        ln -sf ${SCREEN_LOGDIR}/screen-${name}.log.${CURRENT_LOG_TIME} ${SCREEN_LOGDIR}/screen-${name}.log
     fi
 
     # sleep to allow bash to be ready to be send the command - we are
@@ -1377,7 +1377,7 @@ function screen_rc {
         echo "stuff \"$2$NL\"" >> $SCREENRC
 
         if [[ -n ${SCREEN_LOGDIR} ]]; then
-            echo "logfile ${SCREEN_LOGDIR}/screen-${1}.${CURRENT_LOG_TIME}.log" >>$SCREENRC
+            echo "logfile ${SCREEN_LOGDIR}/screen-${1}.log.${CURRENT_LOG_TIME}" >>$SCREENRC
             echo "log on" >>$SCREENRC
         fi
     fi
@@ -1489,8 +1489,8 @@ function _old_run_process {
     exec 6>&-
 
     if [[ -n ${SCREEN_LOGDIR} ]]; then
-        exec 1>&${SCREEN_LOGDIR}/screen-${1}.${CURRENT_LOG_TIME}.log 2>&1
-        ln -sf ${SCREEN_LOGDIR}/screen-${1}.${CURRENT_LOG_TIME}.log ${SCREEN_LOGDIR}/screen-${1}.log
+        exec 1>&${SCREEN_LOGDIR}/screen-${1}.log.${CURRENT_LOG_TIME} 2>&1
+        ln -sf ${SCREEN_LOGDIR}/screen-${1}.log.${CURRENT_LOG_TIME} ${SCREEN_LOGDIR}/screen-${1}.log
 
         # TODO(dtroyer): Hack to get stdout from the Python interpreter for the logs.
         export PYTHONUNBUFFERED=1
diff --git a/lib/dstat b/lib/dstat
index 73ca279fea..a17125fc92 100644
--- a/lib/dstat
+++ b/lib/dstat
@@ -20,7 +20,7 @@ set +o xtrace
 # Defaults
 # --------
 # for DSTAT logging
-DSTAT_FILE=${DSTAT_FILE:-"dstat.txt"}
+DSTAT_FILE=${DSTAT_FILE:-"dstat.log"}
 
 
 # start_dstat() - Start running processes, including screen
diff --git a/stack.sh b/stack.sh
index 048e5d1a1e..f42e68ae08 100755
--- a/stack.sh
+++ b/stack.sh
@@ -370,15 +370,14 @@ if [[ -n "$LOGFILE" || -n "$SCREEN_LOGDIR" ]]; then
 fi
 
 if [[ -n "$LOGFILE" ]]; then
-    # First clean up old log files.  Use the user-specified ``LOGFILE``
-    # as the template to search for, appending '.*' to match the date
-    # we added on earlier runs.
-    LOGDIR=$(dirname "$LOGFILE")
-    LOGFILENAME=$(basename "$LOGFILE")
-    mkdir -p $LOGDIR
-    find $LOGDIR -maxdepth 1 -name $LOGFILENAME.\* -mtime +$LOGDAYS -exec rm {} \;
+    # Clean up old log files.  Append '.*' to the user-specified
+    # ``LOGFILE`` to match the date in the search template.
+    local logfile_dir="${LOGFILE%/*}"           # dirname
+    local logfile_name="${LOGFILE##*/}"         # basename
+    mkdir -p $logfile_dir
+    find $logfile_dir -maxdepth 1 -name $logfile_name.\* -mtime +$LOGDAYS -exec rm {} \;
     LOGFILE=$LOGFILE.${CURRENT_LOG_TIME}
-    SUMFILE=$LOGFILE.${CURRENT_LOG_TIME}.summary
+    SUMFILE=$LOGFILE.summary.${CURRENT_LOG_TIME}
 
     # Redirect output according to config
 
@@ -399,8 +398,8 @@ if [[ -n "$LOGFILE" ]]; then
 
     echo_summary "stack.sh log $LOGFILE"
     # Specified logfile name always links to the most recent log
-    ln -sf $LOGFILE $LOGDIR/$LOGFILENAME
-    ln -sf $SUMFILE $LOGDIR/$LOGFILENAME.summary
+    ln -sf $LOGFILE $logfile_dir/$logfile_name
+    ln -sf $SUMFILE $logfile_dir/$logfile_name.summary
 else
     # Set up output redirection without log files
     # Set fd 3 to a copy of stdout. So we can set fd 1 without losing