openstack/devstack
Code Issues Proposed changes

Add option to make screen starting more robust.

Browse Source 
We have seen a number of failures in ci where a host is overloaded
and the 1.5 second sleep before stuffing data into screen is not
long enough. This means the service doesn't start and tests fail.

This change adds a config option to allow us to turn off the developer
friendly option to stuff text into the screen. When SCREEN_DEV is
set to False it will use a simple exec in screen instead of stuff.
This should be far more reliable because we don't have to wait
for bash to start.

Change-Id: I7f1b5dbf5329b23507cb767d54a2795be0d73e01
This commit is contained in:
Vishvananda Ishaya 2013-02-11 16:48:12 -08:00
parent 098b272cf7
commit 58e2134964
2 changed files with 22 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
functions
View File

@ -738,26 +738,31 @@ function restart_service() {
# Helper to launch a service in a named screen
# screen_it service "command-line"
function screen_it {
NL=`echo -ne '\015'`
SCREEN_NAME=${SCREEN_NAME:-stack}
SERVICE_DIR=${SERVICE_DIR:-${DEST}/status}
SCREEN_DEV=`trueorfalse True $SCREEN_DEV`
if is_service_enabled $1; then
# Append the service to the screen rc file
screen_rc "$1" "$2"
screen -S $SCREEN_NAME -X screen -t $1
# sleep to allow bash to be ready to be send the command - we are
# creating a new window in screen and then sends characters, so if
# bash isn't running by the time we send the command, nothing happens
sleep 1.5
if [[ "$SCREEN_DEV" = "True" ]]; then
# sleep to allow bash to be ready to be send the command - we are
# creating a new window in screen and then sends characters, so if
# bash isn't running by the time we send the command, nothing happens
sleep 1.5
if [[ -n ${SCREEN_LOGDIR} ]]; then
screen -S $SCREEN_NAME -p $1 -X logfile ${SCREEN_LOGDIR}/screen-${1}.${CURRENT_LOG_TIME}.log
screen -S $SCREEN_NAME -p $1 -X log on
ln -sf ${SCREEN_LOGDIR}/screen-${1}.${CURRENT_LOG_TIME}.log ${SCREEN_LOGDIR}/screen-${1}.log
if [[ -n ${SCREEN_LOGDIR} ]]; then
screen -S $SCREEN_NAME -p $1 -X logfile ${SCREEN_LOGDIR}/screen-${1}.${CURRENT_LOG_TIME}.log
screen -S $SCREEN_NAME -p $1 -X log on
ln -sf ${SCREEN_LOGDIR}/screen-${1}.${CURRENT_LOG_TIME}.log ${SCREEN_LOGDIR}/screen-${1}.log
fi
NL=`echo -ne '\015'`
screen -S $SCREEN_NAME -p $1 -X stuff "$2 || touch \"$SERVICE_DIR/$SCREEN_NAME/$1.failure\"$NL"
else
screen -S $SCREEN_NAME -p $1 -X exec /bin/bash -c "$2 || touch \"$SERVICE_DIR/$SCREEN_NAME/$1.failure\""
fi
screen -S $SCREEN_NAME -p $1 -X stuff "$2 || touch \"$SERVICE_DIR/$SCREEN_NAME/$1.failure\"$NL"
fi
}

7
stackrc
View File

@ -29,6 +29,13 @@ ENABLED_SERVICES=g-api,g-reg,key,n-api,n-crt,n-obj,n-cpu,n-net,n-cond,cinder,c-s
# Set the default Nova APIs to enable
NOVA_ENABLED_APIS=ec2,osapi_compute,metadata
# Whether to use 'dev mode' for screen windows. Dev mode works by
# stuffing text into the screen windows so that a developer can use
# ctrl-c, up-arrow, enter to restart the service. Starting services
# this way is slightly unreliable, and a bit slower, so this can
# be disabled for automated testing by setting this value to false.
SCREEN_DEV=True
# Repositories
# ------------