IP Fail. Over Setup Using Keep. Alived on Cent. OS & Red Hat. IP owner case is not working in keepalive and dont know where to use primary ip address ? Keepalived config for Master host(HOST A) which has its interface IP in the VIP block : :interface ip of (eth. VI {state MASTERinterface eth. NONEauth_pass 1. 11. In this file there is no field to specifically save the primary address & all configured addresses goes to the VIP list block. Can you please let me know where i can use primary ip address will be configured in above configuration file. How To Install Haproxy On Centos 7 DocumentationMoreover if we add Primary address (which is always the interface address as ip owner case says) to the VIP block in KA: we see the following issue: :We have two hosts which are participating in a VRRP instance. They have same priorities(above see config): :Host A – Interface IP “3. Lower), priority “1. Host B – Interface IP “3. Higher), priority “1. Description – Currently we have Host B as “Master” and Host A as “Backup” because Host B’s Interface IP is higher than Host A and their priorities are same. We add two entries in the VIP (virtual IP address) block in “Keepalived. HAProxy 就会在后台进行启动。可以使用 ps -ef 查看进程,lsof -i 查看端口占用情况来验证 HAProxy 是否已经运行。若无法连接中继. Установка, настройка и оптимизация серверов Linux, Windows, Веб сервера Apache2, Nginx, DNS сервер Bind, баз. Open-source TCP/HTTP load-balancing proxy server supporting native SSL, keep-alive, compression, CLI stick-tables, custom log formats, header rewriting, redirects. 在日常运维工作中,对于系统和业务日志的处理尤为重要。今天,在这里分享一下自己部署的ELK(+Redis)-开源实时日志分析. Host A interface IP). As per the config if we reload keepalived on both the hosts, Host A interface should become the master as this will be our IP address Owner case. But this does not happens. Expected behavior – Host A Interface should become Master as Interface IP address is same as primary IP (IP address owner case). Current behavior – Host B interface acts as Master. Host A state is fluctuating between Master & Backup and its Not consistent. Secondly when we stop the KA on host A in this scenario it removes the Virtual IP address from the interfaces, since in this case we have added the real interface IP address here thus that IP address is also removed (from the actual interface). This will result in even bad state for a system. Install Scalpel (A Filesystem Recovery Tool) to Recover Deleted Files/Folders in Linux. Many a times it happens that we accidentally or by mistakenly press ‘shift + delete‘ to files. By human nature you have an habit of using ‘shift + Del‘ instead of using only ‘Delete‘ option. I actually had this incident few days back. I was working on a project and saved my work file in a directory. There were many unwanted files in that directory and needs to be deleted permanently. So I started deleting them one by one. While deleting those files, I accidentally pressed ‘shift delete‘ to one of my important file. The file got deleted permanently from my directory. I was wondering how to recover deleted files and had no clue what to do. I almost spent much time restoring the file but no luck. Scalpel Recovery Tool For Linux. Knowing a bit of technical knowledge I knew about how file system and HDD works. When you delete a file accidentally, the content of the file does not get deleted from your computer. It is just removed from the database folder and you cannot see the file into the directory, but it still remains in somewhere in your hard drive. Basically the system has a list pointer to blocks on the storage device still has the data. The data is not deleted from the block storage device unless and until you overwrite with a new file. At this point of view I released that my deleted file may still remain somewhere in an unindexed area of the Hard disk. However it is recommended to immediately unmount a device as soon as you realize that you have deleted any important file. Unmount helps you to prevent the blocked files from overwritten with new file. In this scenario I didn’t want to over write that data, hence I preferred to search in the hard drive without mounting it. Normally in Windows we get tons of 3rd party tools to recovery lost data, but in Linux only few. However I use Ubuntu as an operating system and it is very difficult to find a tool that recovers lost file. During my research I got to know about ‘Scalpel‘ a tool that runs through entire hard drive and recovers a lost file. I installed and successfully recovered my lost file with the help of Scalpel tool. It’s really amazing tool I must say. This can also happen with you as well. So I thought of sharing my experience with you. In this article I will show you how to recover deleted files with the help of scalpel tool. So here we go. What is Scalpel Tool? Scalpel is an open source file system recovery for Linux and Mac operation systems. The tool visits the block database storage and identifies the deleted files from it and recover them instantly. Apart from file recovery it is also useful for digital forensics investigation. How to Install Scalpel in Debian/Ubuntu and Linux Mint. To Install Scalpel, open terminal by doing “CTrl+Alt+T” from desktop and run the following command.$ sudo apt- get install scalpel. Sample Output. Reading package lists.. Done. Building dependency tree. Reading state information.. Done. The following NEW packages will be installed. Need to get 0 B/3. B of archives. After this operation, 1. B of additional disk space will be used. Selecting previously unselected package scalpel. Reading database .. Unpacking scalpel (from ../scalpel_1. Processing triggers for man- db .. Setting up scalpel (1. Installing Scalpel in RHEL/Cent. OS and Fedora. To install scalpel recovery tool, you need to first enable epel repository. Once it enabled, you can do ‘yum‘ to install it as shown.# yum install scalpel. Sample Output. Loaded plugins: fastestmirror. Loading mirror speeds from cached hostfile. Setting up Install Process. Resolving Dependencies. Running transaction check. Package scalpel. i. Finished Dependency Resolution. Dependencies Resolved. Package Arch Version Repository Size. Transaction Summary. Install 1 Package(s). Total download size: 5. Installed size: 1. Is this ok [y/N]: y. Downloading Packages. B 0. 0: 0. 0. Running rpm_check_debug. Running Transaction Test. Transaction Test Succeeded. Running Transaction. Installing : scalpel- 2. Verifying : scalpel- 2. Complete! Once scalpel is installed you need to do text editing. By default scalpel utility has its own configuration file in ‘/etc‘ directory and full path is “/etc/scalpel/scalpel. You can notice that everything is commented out (#). So before running scalpel you need to uncomment the file format that you need to recover. However uncomment the entire file is time consuming and will generate a huge false results. Let say for example I want to recover only ‘. GIF and JPG files (very common). Go to terminal and type following syntax. The ‘/dev/sda. 1‘ is a location of a device from where the file is already deleted.$ sudo scalpel /dev/sda. The ‘- o‘ switch indicates a output directory, where you want to restore your deleted files. Make sure that this directory is empty before running any command otherwise it will give you an error. The output of the above command is. Scalpel version 1. Written by Golden G. Richard III, based on Foremost 0. Opening target "/dev/sda. Image file pass 1/2. GB 3. 9: 1. 6 ETAAs you see, the scalpel is now performing its process and it will take time to recovery your deleted file depending upon the disk space that you are trying to scan and the speed of the machine. I would recommend you all to have a habit of using only delete instead of “Shift + Delete“. Because as said prevention is always better than cure.
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