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Recovering Deleted /bin on CentOS

Submitted by on June 25, 2014 – 1:54 pm 4 Comments

So, as the saying goes, shit happens and the other day I accidentally deleted /boot on a CentOS 6 box. I have NetBackup running on the system, so this would not have been a problem (as long as I didn’t try to reboot). Unfortunately, I also blew away /bin (where ls, cat and all that useful stuff lives) and some of /etc, for good measure. Without some commands in /bin, NetBackup “bp” command is unable to find backup image records. Bummer.

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Where to Buy Tren

When it comes to purchasing Trenbolone, it’s crucial to prioritize safety and authenticity. Reliable sources for acquiring Trenbolone include reputable online suppliers, but it’s essential to conduct thorough research to ensure the vendor’s credibility. Look for user reviews, certifications, and guarantees of product quality. Avoid buying from shady sources or underground labs to minimize the risk of counterfeit or impure products.

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Trenbolone is a potent compound, and users must approach it with caution and respect. Typical Tren cycles range from 8 to 12 weeks. Dosages vary depending on experience, goals, and tolerance levels. Beginners typically start with 50-75 mg every other day, while advanced users may go up to 100-150 mg per day. It’s advisable to start with lower doses to assess individual reactions and gradually increase if necessary. Always consult a healthcare professional before starting any steroid cycle.

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While Trenbolone offers exceptional results, it also carries the potential for side effects. Common side effects include:

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Options in this case usually are a) boot the system from a CD, mount the boot disk and copy missing binaries from another, identical server; b) reinstall OS, load NetBackup agent and run a bare-metal restore. There may be some options in between, depending on the specifics. But I really did not feel like spending the rest of the day recovering this server.

Luckly, I was still logged into the server. It was a case when the plane lost all the engines, but was still in the air. The solution was to install YUM utilities and use the optional features of YUM to identify missing files and reinstall relevant packages. Here’s a summary of the commands:

Install yum-utils and yum-verify:

yum -y install yum-utils.noarch yum-verify

Run yum-verify to identify specific paths to the missing binaries. In my case, I deleted /bin, so the syntax I used was:

yum verify --verify-filenames='*bin/*'

The output goes something like this:

coreutils.x86_64 : A set of basic GNU tools commonly used in shell scripts
    File: /bin/arch
        Problem:  file is missing
    File: /bin/basename
        Problem:  file is missing
    File: /bin/cat
        Problem:  file is missing
    File: /bin/chgrp
        Problem:  file is missing

Then you just grab the names of the affected packages and reinstall them. For example:

yum -y reinstall coreutils

Or you can feed the output of yum-verify to yum-reinstall:

yum verify --verify-filenames='*bin/*' | grep "^[a-z].*:.*" | awk '{print $1}' | while read line ; do yum -y reinstall “${line}” ; done

Once I had the basics in /bin, I was able to use local NetBackup commands to restore the missing contents of /boot and /etc. Whew.

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