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inf3rno's questions

Martin Hope
inf3rno
Asked: 2017-08-01 23:38:43 +0800 CST
  • 2

Afaik. there are 3 types of RAID:

  • hardware - e.g. an expensive PCIE RAID card / or rarely onboard RAID which have a dedicated CPU, probably with write cache and BBU
  • software - e.g. ZFS, MD, BTRFS software RAID
  • fake - e.g. a cheap PCIE RAID card / or most of the onboard RAIDs which uses the RAM and CPU on the motherboard.

By using the BTRFS software RAID the filesytem knows about the drives and when it finds a block with wrong checksum, then it can use the clone (RAID1/10) or the parity (RAID5/6) to restore the affected block and fix the error. So our files won't degrade over time.

The question is whether the same self-healing mechanism works with hardware or fake RAIDs by BTRFS?

I guess there should be an API which the BTRFS can use to access the clone/parity of the affected block and fix it. I think there is a higher chance to have something like this by onboard RAID, but I don't know whether such a thing exists or every RAID is implemented differently and there is not standard API the BTRFS could use.

raid
Martin Hope
inf3rno
Asked: 2012-08-15 13:20:07 +0800 CST
  • 0

My problem is, that the upload directory suddenly changed by a php application. I set it in php.ini to ../upload, and it worked for about 1 year. Now I don't know why, but php uploads to C:\Windows\Temp despite the php.ini-s upload settings.

There is another strange thing with that application. The web.config file doesn't work without the code:

        <handlers>
            <add name="iphonephpcgi" path="*.php" verb="*" modules="FastCgiModule" scriptProcessor="D:\creation\software developer\projects\iphonetok\php-5.2.17\php-cgi.exe" resourceType="Unspecified" />
        </handlers>

The other applications work well, and they uploads to the right directory. Any idea how to fix it?

php
Martin Hope
inf3rno
Asked: 2012-05-15 02:22:56 +0800 CST
  • 17

My problem is, that I have to set env variables (like GIT_EXEC_PATH) on a server. I need that variables by every connection (so by bash and by remote commands either). I managed to set those variables by bash with .bash_profile, but I have problems with the remote commands. I found that it's possible to write commands in ~/.ssh/authorized_keys before the actual rsa key, but I don't wan't to write there always, I need a permanent solution... I found that the ~/.ssh/rc file is executed by every ssh login, so I put there my env variable declarations, but it didn't work. The variables are set in the rc file, but after that they disappeared. :S Maybe the rc file runs in a subshell :S Is there any way to define those variables in bash and in remote commands without code duplication?

Edit:

I edited the question, because the server is a godaddy shared host, so it has a unique config. The /etc/ssh/sshd_config and the /etc/ssh/ssh_config files are empty. There are comments in those files, if you are curious I can copy it here.

  1. The ~/.bash_profile is sourced (by bash connections only),
  2. the ~/.bashrc is never sourced,
  3. the ~/.profile is never sourced,
  4. the ~/.ssh/environment is never sourced,
  5. the ~/.ssh/rc is sourced (by bash and remote both), but I think it's called in subshell, because the variables disappearing.
  6. The ~/.ssh/authorized_keys is sourced by every time, but I have to write the commands before every rsa key (so I don't wan't to configure with that).

Summary:

I can configure the bash well (with .bash_profile), but I cannot configure the remote calls. That's the problem. I'm looking for a file which is sourced by both bash and remote commands.

For example:

The git-upload-pack command finds the exe file, because the GIT_EXEC_PATH env variable is set, but with remote: "git clone [email protected]:myrepo local/myrepo" the server doesn't find that command, because the GIT_EXEC_PATH is not set.

Edit2:

According to this, and my printenv logs: the ~/.ssh/rc is running in normal shell, not in subshell, so it's a riddle why the env variables not sticking...

I created an executable: ~/logenv:

echo "" >> mylog.txt
date >> mylog.txt
printenv >> mylog.txt
echo "" >> mylog.txt

And put this into the ~/.ssh/rc:

export AAA=teszt
source ~/logenv

By bash login & "source logenv" the result was:

Tue May 15 04:21:37 MST 2012
TERM=cygwin
SHELL=/bin/bash
SSH_CLIENT=censored
SSH_TTY=/dev/pts/2
USER=myuser
AAA=teszt
MAIL=/var/mail/myuser
PATH=/usr/local/bin:/bin:/usr/bin
PWD=/home/content/65/7962465
SHLVL=3
HOME=/var/chroot/home/content/65/7962465
LOGNAME=myuser
SSH_CONNECTION=censored
_=/usr/bin/printenv

Tue May 15 04:21:41 MST 2012
HOSTNAME=censored
TERM=cygwin
SHELL=/bin/bash
HISTSIZE=1000
SSH_CLIENT=censored

By remote "ssh [email protected] 'exec ~/logenv'" the result was:

Tue May 15 04:25:52 MST 2012
SHELL=/bin/bash
SSH_CLIENT=censored
USER=myuser
AAA=teszt
MAIL=/var/mail/myuser
PATH=/usr/local/bin:/bin:/usr/bin
PWD=/home/content/65/7962465
SHLVL=3
HOME=/var/chroot/home/content/65/7962465
LOGNAME=myuser
SSH_CONNECTION=censored
_=/usr/bin/printenv

Tue May 15 04:25:52 MST 2012
SHELL=/bin/bash
SSH_CLIENT=censored
USER=myuser
PATH=/usr/local/bin:/bin:/usr/bin
MAIL=/var/mail/myuser
PWD=/home/content/65/7962465
HOME=/var/chroot/home/content/65/7962465

So the rc file is sourced, but after that the variables disappering... :S

linux ssh environment-variables