Analytic

Friday, May 27, 2011

Sendmail gethostbyaddr Problem

The problem is that sendmail tries to resolve the ip of
every interface your have.

Change this line in sendmail.cf:

#O DontProbeInterfaces=False

to

O DontProbeInterfaces=True

and restert the sendmail.

Monday, May 9, 2011

Amzon EC2 - Changing Scale

This script disables the Auto Scaling, because min-size and max-size are zero.

ZONE="us-east-1d"

LC_NAME="myscaling-lc"
SG_NAME="dmcleaner-sg"

as-update-auto-scaling-group $SG_NAME --availability-zones $ZONE --launch-configuration $LC_NAME --min-size 0 --max-size 0

Amazon Auto Scaling

This script is enough for me :)


ZONE="us-east-1d" <=== Availability Zone
SECURITY_GROUP="default"
REGION="us-east-1"
INSTANCE_SIZE="t1.micro"
<=== Instance Type (micro, small, Large, ...)
LB_NAME="myscaling-lb"
LC_NAME="myscaling-lc"
LC_IMAGE_ID="ami-xxxxxxxx" <=== Enter your AMI ID here
SG_NAME="dmcleaner-sg"

# Set up load balancer
elb-create-lb $LB_NAME --headers --listener "lb-port=80,instance-port=80,protocol=http" --availability-zones $ZONE --region $REGION

#Setup Load Balancer Health Check
elb-configure-healthcheck $LB_NAME --headers --target "HTTP:80/index.php" --interval 5 --timeout 2 --unhealthy-threshold 2 --healthy-threshold 2 --region $REGION


# Setup Auto Scaling
as-create-launch-config $LC_NAME --image-id $LC_IMAGE_ID --instance-type $INSTANCE_SIZE --group $SECURITY_GROUP --region $REGION

#Setup Auto Scaling Group
as-create-auto-scaling-group $SG_NAME --availability-zones $ZONE --launch-configuration $LC_NAME --min-size 1 --max-size 6 --load-balancers $LB_NAME --health-check-type ELB --grace-period 60 --region $REGION

# Setup Scaling Policies (to add instance)
SCALE_UP_POLICY=`as-put-scaling-policy MyScaleUpPolicy1 --auto-scaling-group $SG_NAME --adjustment=1 --type ChangeInCapacity --cooldown 300 --region $REGION`

#Setup Alarm (Add instance when CPU Load is more then 70%)
mon-put-metric-alarm MyHighCPUAlarm1 --region $REGION --comparison-operator GreaterThanThreshold --evaluation-periods 1 --metric-name CPUUtilization --namespace "AWS/EC2" --period 60 --statistic Average --threshold 70 --alarm-actions $SCALE_UP_POLICY --dimensions "AutoScalingGroupName=$SG_NAME"

# Setup Scaling Policies (to reduce instance)
SCALE_DOWN_POLICY=`as-put-scaling-policy MyScaleDownPolicy1 --auto-scaling-group $SG_NAME --adjustment=-1 --type ChangeInCapacity --cooldown 300 --region $REGION`

#Setup Alarm (Reduce instance when CPU Load is less then 30%)
mon-put-metric-alarm MyLowCPUAlarm1 --region $REGION --comparison-operator LessThanThreshold --evaluation-periods 1 --metric-name CPUUtilization --namespace "AWS/EC2" --period 60 --statistic Average --threshold 30 --alarm-actions $SCALE_DOWN_POLICY --dimensions "AutoScalingGroupName=$SG_NAME"