Difference between revisions of "Linux utils"

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* [[Pi Roles]]
 
* [[Pi Roles]]
  
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* how to tell if port 80 is listening? What is listening on a particular port?
 
* how to tell if port 80 is listening? What is listening on a particular port?
 
  netstat -plnt
 
  netstat -plnt
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* ubuntu vpn https://hide.me/en/vpnsetup/ubuntu/openvpn/
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=== Find large files ===
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* Find large files  
 
  find / -xdev -type f -size +100M
 
  find / -xdev -type f -size +100M
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=== see timestamp in history ===
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* see timestamps in history
 
  echo 'export HISTTIMEFORMAT="%d/%m/%y %T "' >> ~/.bashrc ; source ~/.bashrc
 
  echo 'export HISTTIMEFORMAT="%d/%m/%y %T "' >> ~/.bashrc ; source ~/.bashrc
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=== Generate large random file ===
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* Generate large random file
 
  dd if=/dev/urandom of=/var/log/mongodb/randomFile bs=1M count=200
 
  dd if=/dev/urandom of=/var/log/mongodb/randomFile bs=1M count=200
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=== Add ssh key to a server ===
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* Add ssh key to a server
 
  cat ~/.ssh/id_rsa.pub | ssh user@hostname 'cat >> .ssh/authorized_keys'
 
  cat ~/.ssh/id_rsa.pub | ssh user@hostname 'cat >> .ssh/authorized_keys'
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=== Add identity to a server ===
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* Add identity to a server
 
  ssh-copy-id -i ~.ssh/key_name.pub user@host
 
  ssh-copy-id -i ~.ssh/key_name.pub user@host
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=== Create a user ===
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* Create a user  
 
  su - <username>
 
  su - <username>
 
  sudo visudo -f /etc/sudoers
 
  sudo visudo -f /etc/sudoers
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  (and there is deluser)
 
  (and there is deluser)
 
  (I don't think I need this: usermod -aG sudo username ) - for making him a sudoer
 
  (I don't think I need this: usermod -aG sudo username ) - for making him a sudoer
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* Establish a simple ssh port forward  
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== Nodes ==
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This one, before I started sticking Node.js in there.
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WARNING! in the codebase node listens on 3000. In production it listens on 3007.
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<pre>
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piousbox@piousbox-laptop:~/projects/rails-quick-start$ knife node show app_server_21
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Node Name:  app_server_21
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Environment: _default
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FQDN:       
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IP:          10.0.1.151
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Run List:    role[base], role[ish_static], role[marchesi_static], role[wiki_cac], role[wp_wasya]
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Roles:      base, ish_static, marchesi_static, wiki_cac, wp_wasya
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Recipes:    zsh, users::sysadmins, sudo, apt, nagios::client, git, build-essential, ish::base_apache, ish::static_site, ish_apache::static_site, ish_apache::base_apache, ish::base_php, mysql::client, mediawiki::default, mediawiki::appserver, wordpress::default
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Platform:    ubuntu 12.04
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Tags:     
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</pre>
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This is a successful deployment except change node's listening from 3000 to 3007:
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<pre>
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piousbox@piousbox-laptop:~/projects/rails-quick-start$ knife node show app_server_21
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Node Name:  app_server_21
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Environment: _default
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FQDN:       
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IP:          10.0.1.151
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Run List:    role[base], role[node_exampler]
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Roles:      base, node_exampler
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Recipes:    zsh, users::sysadmins, sudo, apt, nagios::client, git, build-essential, node::base, node::upstream
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Platform:    ubuntu 12.04
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Tags:       
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</pre>
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The load balancer:
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<pre>
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ubuntu@ip-10-0-0-52:/etc/apache2/sites-available$ pwd
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/etc/apache2/sites-available
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ubuntu@ip-10-0-0-52:/etc/apache2/sites-available$ cat startups_staging
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<VirtualHost *:80>
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  ServerAdmin piousbox@gmail.com
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  ServerName annesque.com
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  KeepAlive On
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  ProxyVia On
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  ProxyPreserveHost On
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  ServerAlias staging.annesque.com
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  ServerAlias startups.piousbox.com
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  ServerAlias staging.startups.piousbox.com
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  ProxyPreserveHost On
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  ProxyVia On
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  <proxy>
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    Order deny,allow
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    Allow from all
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  </proxy>
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  ProxyPass /api/ http://10.0.1.151:3007/ connectiontimeout=15 timeout=45
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  ProxyPassReverse /api/ http://10.0.1.151:3007/
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  ProxyPass / http://10.0.1.72:3010/ connectiontimeout=15 timeout=45
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  ProxyPassReverse / http://10.0.1.72:3010/
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</VirtualHost>
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</pre>
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=== Utils ===
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Remember the virtual site for combining a node backend into some other service?
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<pre>
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<VirtualHost *:3098>
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  ServerAdmin piousbox@gmail.com
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  ServerName localhost
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  KeepAlive On
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  ProxyVia On
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  ProxyPreserveHost On
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  <proxy>
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    Order deny,allow
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    Allow from all
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  </proxy>
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  ProxyPass /api/ http://localhost:3000/ connectiontimeout=15 timeout=45
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  ProxyPassReverse /api/ http://localhost:3000/
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  ProxyPass / http://localhost:8000/ connectiontimeout=15 timeout=45
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  ProxyPassReverse / http://localhost:8000/
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</VirtualHost>
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</pre>
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==== Establish a simple ssh port forward ====
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10.0.0.x is public, 10.0.1.x is private. Do:
 
10.0.0.x is public, 10.0.1.x is private. Do:
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  sudo iptables -t nat -A POSTROUTING -j MASQUERADE
 
  sudo iptables -t nat -A POSTROUTING -j MASQUERADE
  
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=== Reset Chef UI Password ===
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* Reset Chef UI Password  
 
  sudo -u opscode-pgsql  /opt/chef-server/embedded/bin/psql opscode_chef
 
  sudo -u opscode-pgsql  /opt/chef-server/embedded/bin/psql opscode_chef
 
  update osc_users set hashed_password = '$2a$12$y31Wno2MKiGXS3FSgVg5UunKG48gJz0pRV//RMy1osDxVbrb0On4W' , salt ='$2a$12$y31Wno2MKiGXS3FSgVg5Uu' where username ='admin';
 
  update osc_users set hashed_password = '$2a$12$y31Wno2MKiGXS3FSgVg5UunKG48gJz0pRV//RMy1osDxVbrb0On4W' , salt ='$2a$12$y31Wno2MKiGXS3FSgVg5Uu' where username ='admin';
  
 
and login with user 'admin' and password 'password'.
 
and login with user 'admin' and password 'password'.

Revision as of 22:36, 15 December 2016

Utils

  • Set date
sudo date --set "25 Sep 2013 15:00:00"
  • check disks on ubuntu
sudo lsblk
  • check that a node is pingable in bash
while ! ping -c1 bjjc_spec_22.ubuntu14 &>/dev/null; do :; done ;
  • how to tell if port 80 is listening?
telnet?
  • how do I know if the system trusts the certificate?
you use curl.
  • how to tell if port 80 is listening? What is listening on a particular port?
netstat -plnt

find / -xdev -type f -size +100M
  • see timestamps in history
echo 'export HISTTIMEFORMAT="%d/%m/%y %T "' >> ~/.bashrc ; source ~/.bashrc
  • Generate large random file
dd if=/dev/urandom of=/var/log/mongodb/randomFile bs=1M count=200
  • Add ssh key to a server
cat ~/.ssh/id_rsa.pub | ssh user@hostname 'cat >> .ssh/authorized_keys'
  • Add identity to a server
ssh-copy-id -i ~.ssh/key_name.pub user@host
  • Create a user 
su - <username>
sudo visudo -f /etc/sudoers
sudo adduser --disabled-password <username>
(and there is deluser)
(I don't think I need this: usermod -aG sudo username ) - for making him a sudoer
  • Establish a simple ssh port forward

10.0.0.x is public, 10.0.1.x is private. Do: 

sudo sysctl net.ipv4.ip_forward=1
sudo iptables -t nat -A PREROUTING -p tcp -d 10.0.0.229 --dport 2270 -j DNAT --to-destination 10.0.1.224:22
sudo iptables -t nat -A POSTROUTING -j MASQUERADE
  • Reset Chef UI Password 
sudo -u opscode-pgsql  /opt/chef-server/embedded/bin/psql opscode_chef
update osc_users set hashed_password = '$2a$12$y31Wno2MKiGXS3FSgVg5UunKG48gJz0pRV//RMy1osDxVbrb0On4W' , salt ='$2a$12$y31Wno2MKiGXS3FSgVg5Uu' where username ='admin';

and login with user 'admin' and password 'password'.

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