ooOk.

5 years ago · efcc8a84e0
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 \documentclass[11pt]{article}
 %Gummi|065|=)
 \title{\textbf{AutoSSH - a Reverse Proxy Alternative}}
 \usepackage{graphicx}
 \usepackage{caption  }
 \author{Steak Electronics}
 \date{06/4/19}
 \begin{document}
 %\maketitle
 \textbf{AutoSSH - a Reverse Proxy Alternative}
 \vspace{0.2in}
 This document is best read printed out on paper.
 %\textbf{Todo}
 \section{Overview}
 I recently added another apache server to an existing infrastructure, and I wanted it to be accessible under a similar IP as another server. Due to the complexity of the website, it was not possible to simply do a reverse proxy without knowing the correct settings (e.g. X-Forwarded for). Instead, AutoSSH was used.
 \section{Work Log}
 Ok, I'm going to get right to the configs that I used. You want the tool, you don't need to know all the details.
 \subsection{Crontab}
 Here is the crontab script I used. I put this in /etc/crontab, so it has root after the times. I only use /etc/crontab, as it's easier to manage.
 \begin{verbatim}
 * * * * * root  pgrep autossh > /dev/null || \
 /usr/local/bin/autosshzm/autosshzm.sh
 \end{verbatim}
 A few notes about this. Pgrep will search for autossh. If it doesn't find it, then it will try the next command. (|| is an OR). Put the bash script wherever you want.
 \subsection{Bash Script}
 This script is obviously what the crontab calls.
 \begin{verbatim}
 #!/bin/bash
 logger " /usr/local/bin/autosshzm script started."
 #source $HOME/.bash_profile #not needed.
 source $HOME/.keychain/$HOSTNAME-sh
 logger " /usr/local/bin/autosshzm sourced."
 autossh   -L 0.0.0.0:2:localhost:80 -f user@ipaddress sleep 31536000
 &> /var/log/autosshzm/autosshzm.log
 #autossh  -M 0 -o "ServerAliveInterval 30" -o "ServerAliveCountMax 3"
 -L 0.0.0.0:2:localhost:80 user@ipaddress &>
 /var/log/autosshzm/autosshzm.log
 logger "auto ssh ran"
 \end{verbatim}
 Note that the second autossh does not work, as it's missing the sleep and the -f command. \footnote{Figuring this kind of stuff out can take about an hour.} In order for this to work, you'll also need the following commands:
 \begin{verbatim}
 apt-get install keychain autossh
 \end{verbatim}
 There were some more setup steps required for keychain...
 From stackexchange:
 \begin{verbatim}
 25
 keychain
 solves this in a painless way. It's in the repos for Debian/Ubuntu:
 sudo apt-get install keychain
 and perhaps for many other distros (it looks like it originated 
 from Gentoo).
 This program will start an ssh-agent if none is running, and
 provide shell scripts that can be sourced and connect the current
 shell to this particular ssh-agent.
 For bash, with a private key named id_rsa, add the following to
 your .profile:
 keychain --nogui id_rsa
 This will start an ssh-agent and add the id_rsa key on the first
 login after reboot. If the key is passphrase-protected, it will
 also ask for the passphrase. No need to use unprotected keys
 anymore! For subsequent logins, it will recognize the agent
 and not ask for a passphrase again.
 Also, add the following as a last line of your .bashrc:
 . ~/.keychain/$HOSTNAME-sh
 This will let the shell know where to reach the SSH agent managed
 by keychain. Make sure that .bashrc is sourced from .profile.
 However, it seems that cron jobs still don't see this. As a
 remedy, include the line above in the crontab, just before
 your actual command:
 * * * * * . ~/.keychain/$HOSTNAME-sh; your-actual-command
 \end{verbatim}
 The only thing that I needed to do here was
 keychain --nogui id\_rsa
 The rest of it (notes about crontab) was not required.
 \section{What Did NOT Work}
 Here's some things I tried that did not work.
 \begin{itemize}
 \item https://github.com/obfusk/autossh-init - This init script, didn't do much for me. Remember, I'm stuck with systemd in Ubuntu 19.04...\footnote{The scourge of deleting software history. Keep backwards compatibility at ALL COSTS, developers.}
 \item Reverse proxy with Apache - As I said, my website \footnote{Some people might call it a web application. I will not.} was too complex, and I didn't want to go down that rabbit hole.
 \item Starting AutoSSH in rc.local. Didn't work.
 \end{itemize}
 \end{document}
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 \documentclass[11pt]{article}
 %Gummi|065|=)
 \title{\textbf{Router Fail - Network Down!}}
 \usepackage{graphicx}
 \usepackage{caption  }
 \author{Steak Electronics}
 \date{06/4/19}
 \begin{document}
 %\maketitle
 \textbf{Router Fail - Network Down}
 %\textbf{Todo}
 \section{Overview}
 A company had the internet go down. The way their system was built, they had a 2nd firewall behind a cable company router. I was able to access the network before the firewall, which meant that their firewall might've failed.
 \section{Diagnosis}
 The internal firewall had no LED power light or activity. So, no internet.
 First, their network was a 192.168.0.0/24 subnet. I first put them behind a second wireless router which was upstream of the cable modem and not offline. However the network of that internet router was 192.168.1.0/24. This means a few things. 1) All computers (Windows unfortunately), must be set to DHCP (in this case they were all static), and leases must be renewed. So, at least you need a reboot of computers in this situation. 2) They had server software in the LAN that depended upon the 192.168.0.0/24 subnet to work. I didn't find this out until later.
 Originally, I started with the default wireless network of 192.168.1.0/24 but I found that the server software wasn't working. In this case, the most efficient way to rebuild the network, with all the statics intact, was to set the new (temporary) replacement router to be the same subnet. I didn't have the password for the wireless router, so a simple factory reset enabled me access (although lucky for me, the default subnet was in fact 192.168.0.0/24).
 \section{Conclusion}
 When replacing a failed router in a situation like this, the new router should ideally have the same subnet. You might be able to get away without this in smaller offices, but if there is any server software, or if the computers have static IPs \footnote{Or if any other device hsa a static ip, e.g. CCTV camera} you will run into a few more minutes of work.
 There are no rules; this is not set in stone, however, it's the easiest path. As this was only a temporary router replacement, it was not important to have the network 1:1 with the original. In my setups, (this network was not mine) I prefer to have redundant hardware, so you can replace a broken firewall, with a similarly configured duplicate.
 \end{document}
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 \documentclass[11pt]{article}
 %Gummi|065|=)
 \title{\textbf{AutoSSH - a Reverse Proxy Alternative}}
 \usepackage{graphicx}
 \usepackage{caption  }
 \author{Steak Electronics}
 \date{06/4/19}
 \begin{document}
 %\maketitle
 \textbf{AutoSSH - a Reverse Proxy Alternative}
 \vspace{0.2in}
 This document is best read printed out on paper.
 %\textbf{Todo}
 \section{Overview}
 I recently added another apache server to an existing infrastructure, and I wanted it to be accessible under a similar IP as another server. Due to the complexity of the website, it was not possible to simply do a reverse proxy without knowing the correct settings (e.g. X-Forwarded for). Instead, AutoSSH was used.
 \section{Work Log}
 Ok, I'm going to get right to the configs that I used. You want the tool, you don't need to know all the details.
 \subsection{Crontab}
 Here is the crontab script I used. I put this in /etc/crontab, so it has root after the times. I only use /etc/crontab, as it's easier to manage.
 \begin{verbatim}
 * * * * * root  pgrep autossh > /dev/null || \
 /usr/local/bin/autosshzm/autosshzm.sh
 \end{verbatim}
 A few notes about this. Pgrep will search for autossh. If it doesn't find it, then it will try the next command. (|| is an OR). Put the bash script wherever you want.
 \subsection{Bash Script}
 This script is obviously what the crontab calls.
 \begin{verbatim}
 #!/bin/bash
 logger " /usr/local/bin/autosshzm script started."
 #source $HOME/.bash_profile #not needed.
 source $HOME/.keychain/$HOSTNAME-sh
 logger " /usr/local/bin/autosshzm sourced."
 autossh   -L 0.0.0.0:2:localhost:80 -f user@ipaddress sleep 31536000
 &> /var/log/autosshzm/autosshzm.log
 #autossh  -M 0 -o "ServerAliveInterval 30" -o "ServerAliveCountMax 3"
 -L 0.0.0.0:2:localhost:80 user@ipaddress &>
 /var/log/autosshzm/autosshzm.log
 logger "auto ssh ran"
 \end{verbatim}
 Note that the second autossh does not work, as it's missing the sleep and the -f command. \footnote{Figuring this kind of stuff out can take about an hour.} In order for this to work, you'll also need the following commands:
 \begin{verbatim}
 apt-get install keychain autossh
 \end{verbatim}
 There were some more setup steps required for keychain...
 From stackexchange:
 \begin{verbatim}
 25
 keychain
 solves this in a painless way. It's in the repos for Debian/Ubuntu:
 sudo apt-get install keychain
 and perhaps for many other distros (it looks like it originated 
 from Gentoo).
 This program will start an ssh-agent if none is running, and
 provide shell scripts that can be sourced and connect the current
 shell to this particular ssh-agent.
 For bash, with a private key named id_rsa, add the following to
 your .profile:
 keychain --nogui id_rsa
 This will start an ssh-agent and add the id_rsa key on the first
 login after reboot. If the key is passphrase-protected, it will
 also ask for the passphrase. No need to use unprotected keys
 anymore! For subsequent logins, it will recognize the agent
 and not ask for a passphrase again.
 Also, add the following as a last line of your .bashrc:
 . ~/.keychain/$HOSTNAME-sh
 This will let the shell know where to reach the SSH agent managed
 by keychain. Make sure that .bashrc is sourced from .profile.
 However, it seems that cron jobs still don't see this. As a
 remedy, include the line above in the crontab, just before
 your actual command:
 * * * * * . ~/.keychain/$HOSTNAME-sh; your-actual-command
 \end{verbatim}
 The only thing that I needed to do here was
 keychain --nogui id\_rsa
 The rest of it (notes about crontab) was not required.
 \section{What Did NOT Work}
 Here's some things I tried that did not work.
 \begin{itemize}
 \item https://github.com/obfusk/autossh-init - This init script, didn't do much for me. Remember, I'm stuck with systemd in Ubuntu 19.04...\footnote{The scourge of deleting software history. Keep backwards compatibility at ALL COSTS, developers.}
 \item Reverse proxy with Apache - As I said, my website \footnote{Some people might call it a web application. I will not.} was too complex, and I didn't want to go down that rabbit hole.
 \item Starting AutoSSH in rc.local. Didn't work.
 \end{itemize}
 \end{document}
--- a/2019/AutoSSH_and_Reverse_Proxy_Alternative/docs/2.tex~
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