Service management of Sage - D

[lingu]

(07-12-2016 05:54 PM)YU_Xinjie Wrote:  goal

1. the script can be used in both sage_portal & glad_portal to start/stop/status sage.
2. user can start sage before glad, and stop sage after glad.

The script would replace the current start.sh/stop.sh/status.sh in the future.
The script may inspire us about how to set up regression tests for sage.

For shbio's project, I have already written a script /thinker/dstore/run/sage to support a part of the goal. I would try to generalize it.

config design

The brief idea is to use auntie to send a file to glad_portal. Then check the file content.

1.
require sage_user can password-less login sage_user@sage_portal
copy private key of sage_user@sage_portal into $gb/conf/sage_key

Then glad operative user & sage_user can use sage_key to execute remote command to sage_user@sage_portal.

2. The glad_portal IP can be get from $gb/conf/config.sh

3.
create a config file $gb/conf/sage_portal_ip to record the IP of sage_portal. Or we can also write it into $gb/conf/config.sh.

4. let sage_user@sage_portal can password-less login glad_user@glad_portal.

start sage

Code:

wait_sage_start () {
content="This is test content."
echo $content > $curdir/${USER}_sage_testfile
test_file=/thinker/bin/ephemeral/667.sagetest

# 30 seconds timeout
try_cnt=10
while [[ ("$try_cnt" -gt "0") && ((! -f "$test_file") || ("$(cat $test_file)" != "$content")) ]]; do
  timeout -s SIGINT 1 bash -c "sage_user=$sage_user $curdir/auntie ^$curdir/${USER}_sage_testfile $glad_portal 667 sagetest" || echo -n ''
  echo "Trying to start Sage..."
  sleep 2
  try_cnt=$((try_cnt-1))
done
rm -f $test_file

if [[ "$try_cnt" == "0" ]];then
  # timeout
  return 1
else
  return 0
fi
}

start_sage () {
# check whether sage is really stopped.
local tmp="$(status_sage)"
if [[ "$tmp" != "Sage is stopped." ]]; then
  echo "Sage is already started."
  echo ""
  echo "Status: "
  echo "$tmp"
  return 0
fi

remote_cmd "screen -dmS sage_service bash -c 'cd ~/sage; ./start.sh'"

local rt="succ"
wait_sage_start || rt="fail"
if [[ "$rt" == "succ" ]]; then
  echo "Sage is started."
else
  echo "Sage fails to start."
fi
}

stop sage

Code:

stop_sage () {
# stop sage
remote_cmd "cd ~/sage; ./stop.sh" > /dev/null

# kill all sage_service screens
remote_cmd "
for session in \$(screen -ls | grep 'sage_service' | grep -o '[0-9]\+\.' | grep -o '[0-9]\+')
do
    screen -S \${session} -p 0 -X quit
done
"

# check whether sage is really stopped.
local tmp="$(status_sage)"
if [[ "$tmp" == "Sage is stopped." ]]; then
  echo "Sage is stopped."
else
  echo "Sage failed to stop."
  echo ""
  echo "Status: "
  echo "$tmp"
fi
}

status sage

Code:

status_sage () {
local output="$(remote_cmd "cd ~/sage; ./status.sh")"
if [[ "$output" == "Sage is stopped." ]]; then
  echo "Sage is stopped."
else
  echo "$output"
fi
}

OK.