Data availability is one of the biggest concern in IT industry. After moving most of my services to the AWS cloud I was thinking how I can ensure data availability and accuracy in case of AWS data center failure or what if my EC2 EBS volume gets corrupted. A case study I have a Oracle …
#1: Displaying the Status of Your Firewall Type the following command as root: # iptables -L -n -v Sample outputs: Chain INPUT (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination Chain FORWARD (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination Chain …
Delete a file called abc.sh: rm abc.sh Type the following command: # debugfs -w /dev/mapper/root At debugfs: prompt type lsdel command: debugfs: lsdel Sample outputs: Inode Owner Mode Size Blocks Time deleted 2113537 0 120777 3 1/ 1 Tue May 1 06:21:22 2016 1 deleted inodes found. Get block data, enter: debugfs: logdump -i <2113537> …
Howto: Recover a file when you don’t know inode number in Linux Read More »
A step-by-step guide for recovering files using debugfs [root@unix-support-server ~]# mount /dev/sda2 on / type ext4 (rw) proc on /proc type proc (rw) sysfs on /sys type sysfs (rw) devpts on /dev/pts type devpts (rw,gid=5,mode=620) tmpfs on /dev/shm type tmpfs (rw) /dev/sda1 on /boot type ext4 (rw) /dev/sdb1 on /var/www type ext3 (rw) /dev/sdd1 on …
It is possible to recover the file using the “fsdb” command (filesystem debugger). when, No new files have been created on the filesystem. No files have been extended. The filesystem is able to be unmounted. Warning: I have test this in my test server. This is undocumented one. You may facing the critical problem when …
{ “Version”: “2012-10-17”, “Statement”: [ { “Action”: [ “rds:Describe*”, “rds:ListTagsForResource”, “rds:Download*”, “ec2:DescribeAccountAttributes”, “ec2:DescribeAvailabilityZones”, “ec2:DescribeSecurityGroups”, “ec2:DescribeVpcs” ], “Effect”: “Allow”, “Resource”: “*” }, { “Action”: [ “cloudwatch:GetMetricStatistics”, “logs:DescribeLogStreams”, “logs:GetLogEvents” ], “Effect”: “Allow”, “Resource”: “*” } ] }
There is an easy way to access to Instance information from within. This is very useful when writing scripts who are executed inside the Instance. The method is accessing the Instance Metadata using a HTTP GET call to the IP 169.254.169.254. It works on any EC2 instance and the IP address is always the same. …
You must know that sar is a very effective tool to collect system activity or performance information from your system. To collect all information: sar -o test.log -A 1 3 2>&1 >/dev/null This command will make a binary file from output, and you can display it with sadf command: sadf -t -d test.log — -A …
Download Scripts https://aws.amazon.com/code/8720044071969977 Install Prerequisite Packages sudo yum install wget unzip perl-core perl-DateTime perl-Sys-Syslog perl-CPAN perl-libwww-perl perl-Crypt-SMIME perl-Crypt-SSLeay Install LWP Perl Bundles Launch cpan sudo perl -MCPAN -e shell Install Bundle install Bundle::LWP6 LWP YAML Install Script wget http://aws-cloudwatch.s3.amazonaws.com/downloads/CloudWatchMonitoringScripts-1.2.1.zip unzip CloudWatchMonitoringScripts-1.2.1.zip -d /opt rm -f CloudWatchMonitoringScripts-1.2.1.zip Setup Credentials API Access Key (Option 1) This is …
Setup AWS Cloudwatch Memory and Drive Monitoring on RHEL Read More »
Scenario: I’m looking for PID for which PORT 2817 is using here in Solaris 11. -bash-3.2# netstat -an | grep 2817 *.2817 *.* 0 0 49152 0 LISTEN 10.0.50.81.2817 10.0.50.81.37374 49152 0 49152 0 CLOSE_WAIT 10.0.50.81.2817 10.0.50.81.35510 49152 0 49152 0 CLOSE_WAIT 10.0.50.81.2817 10.0.50.81.34478 49152 0 49152 0 CLOSE_WAIT Here is a script, I found …