Configure Amazon CloudWatch Monitoring Scripts for Linux

Installing dependencies

yum install cpan
yum install perl-Time-HiRes
cpan >> install Switch
yum install zip unzip
yum install wget
yum install perl-Crypt-SSLeay


wget http://ec2-downloads.s3.amazonaws.com/cloudwatch-samples/CloudWatchMonitoringScripts-v1.1.0.zip
unzip CloudWatchMonitoringScripts-v1.1.0.zip
cd aws-scripts-mon/

vi awscreds.template
AWSAccessKeyId=
AWSSecretKey=

Test it
./mon-put-instance-data.pl --mem-util --mem-used --mem-avail --disk-path=/ --disk-space-util --disk-space-used --disk-space-avail --swap-used --aws-credential-file=/root/aws-scripts-mon/awscreds.template

Add it to cron
* * * * * /usr/bin/perl /root/aws-scripts-mon/mon-put-instance-data.pl --mem-util --mem-used --mem-avail --aws-credential-file=/root/aws-scripts-mon/awscreds.template --from-cron

 

 

[Errno 13] Permission denied: '/var/log/keystone/keystone.log'

[root@controller2 ~]# tail -f /var/log/keystone/keystone-startup.log
_setup_logging_from_conf(product_name, version)
File "/usr/lib/python2.6/site-packages/keystone/openstack/common/log.py", line 525, in _setup_logging_from_conf
filelog = logging.handlers.WatchedFileHandler(logpath)
File "/usr/lib64/python2.6/logging/handlers.py", line 377, in __init__
logging.FileHandler.__init__(self, filename, mode, encoding, delay)
File "/usr/lib64/python2.6/logging/__init__.py", line 827, in __init__
StreamHandler.__init__(self, self._open())
File "/usr/lib64/python2.6/logging/__init__.py", line 846, in _open
stream = open(self.baseFilename, self.mode)
IOError: [Errno 13] Permission denied: '/var/log/keystone/keystone.log'

 

chown keystone.keystone /var/log/keystone/keystone.log

 

Virtual Ip With Keepalived as Front end for HAproxy server's

Install Keepalived
Virtual Ip 192.168.216.100

HAproxy Ip 192.168.216.101
1. Install Keepalived package:

On RHEL/CentOS:

$ yum install -y centos-release
$ yum install -y keepalived
$ chkconfig keepalived on

2. Tell kernel to allow binding non-local IP into the hosts and apply the changes:

$ echo "net.ipv4.ip_nonlocal_bind = 1" >> /etc/sysctl.conf
$ sysctl -p

Configure Keepalived and Virtual IP
1. Login into LB1 and add following line into /etc/keepalived/keepalived.conf:

vrrp_script chk_haproxy {
script "killall -0 haproxy" # verify the pid existance
interval 2 # check every 2 seconds
weight 2 # add 2 points of prio if OK
}

vrrp_instance VI_1 {
interface eth2 # interface to monitor
state MASTER
virtual_router_id 51 # Assign one ID for this route
priority 101 # 101 on master, 100 on backup
virtual_ipaddress {
192.168.216.100 # the virtual IP
}
track_script {
chk_haproxy
}
}
2. Login into LB2 and add following line into /etc/keepalived/keepalived.conf:

vrrp_script chk_haproxy {
script "killall -0 haproxy" # verify the pid existance
interval 2 # check every 2 seconds
weight 2 # add 2 points of prio if OK
}

vrrp_instance VI_1 {
interface eth2 # interface to monitor
state MASTER
virtual_router_id 51 # Assign one ID for this route
priority 100 # 101 on master, 100 on backup
virtual_ipaddress {
192.168.216.100 # the virtual IP
}
track_script {
chk_haproxy
}
}
3. Start Keepalived in both nodes:

$ sudo /etc/init.d/keepalived start
4. Verify the Keepalived status. LB1 should hold the VIP and the MASTER state while LB2 should run as BACKUP state without VIP:

LB1 IP:

$ ip a | grep -e inet.*eth2
inet 192.168.216.101/24 brd 192.168.216.255 scope global eth2
inet 192.168.216.100/32 scope global eth2