def add_worker():
if 'authorized' in session and session[
'authorized'] is True and 'type' in session and session[
'type'] == 'admin':
ScalingTool.spawn_one_instance()
dbm = DataBaseManager()
uth, dth, ex_ratio, s_ratio, mode = dbm.get_scaling_settings()
mode = 'manual'
dbm.scaling(str(int(uth)), str(int(dth)), str(int(ex_ratio)),
str(int(s_ratio)), mode)
return redirect(url_for('admin_main_landing'))
return redirect(url_for('index'))
def admin_main_landing():
if 'authorized' in session and session[
'authorized'] is True and 'type' in session and session[
'type'] == 'admin':
cpu_stats, instances, _x = ScalingTool.get_instances_load()
instance_list = [dict['InstanceId'] for dict in instances]
length = len(cpu_stats)
dbm = DataBaseManager()
uth, dth, ex_ratio, s_ratio, mode = dbm.get_scaling_settings()
return render_template('adminhome.html',
length=length,
instance_list=instance_list,
cpu_stats=cpu_stats,
ex_ratio=ex_ratio,
s_ratio=s_ratio,
uth=uth,
dth=dth,
mode=mode)
return redirect(url_for('index'))
import time
from app.tools.scalingTools import ScalingTool
from app.tools.dbTools import DataBaseManager
print('Scaling application has started...')
while True:
time.sleep(10)
# Get database scaling settings
dbm = DataBaseManager(False)
instance_start_load, instance_termination_load, up_scale_factor, down_scale_factor, mode = dbm.get_scaling_settings()
if mode != 'auto':
continue
# Get number of instances in service on load balancer
total_running_instances = ScalingTool.get_number_of_in_service_instances_in_load_balancer()
# Read load balancer average instance loads
avg_load = ScalingTool.get_load_balancer_instances_avg_load()
print('Avg. CPU load = {}'.format(avg_load))
# Should instances be terminated?
if avg_load < instance_termination_load:
n_instances_to_terminate = total_running_instances - total_running_instances // down_scale_factor
expected_n_instances = total_running_instances - n_instances_to_terminate
if expected_n_instances <= 1:
print('Expected number of instances limited to 1')
n_instances_to_terminate = total_running_instances - 1