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| − | = THIS PAGE IS A DRAFT, NOT A REAL COURSE PAGE =
| + | [http://wiki.littlesvr.ca/wiki/OPS345_Lab_3 This page has moved.] |
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| − | ''' The current schedule for OPS345 is here: [[OPS335_Weekly_Schedule]]
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| − | * www instance was created in the last lab, with a static private IP, and port fowarding done from port 2211 on router to port 22 on www.
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| − | * yum install httpd iptables-services
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| − | * enable iptables
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| − | * before starting the service, we'll configure the server to store all webpages on a separate volume: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ebs-attaching-volume.html
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| − | ** 1GB in us-east-1a
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| − | ** rename to www-data
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| − | ** attach to www (note reboot is not required)
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| − | * ls /dev/xvd* -l # note /dev/xvdf
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| − | * vgcreate vg_www /dev/xvdf
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| − | * lvcreate -n lv_www -l 100%FREE vg_www
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| − | * blkid
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| − | * ls /dev/mapper/vg_www-lv_www
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| − | * mkfs.ext4 -L www /dev/mapper/vg_www-lv_www
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| − | * vi /etc/fstab
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| − | ** /dev/mapper/vg_www-lv_www /var/www ext4 defaults 0 0
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| − | * mount /var/www/
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| − | * ls /var/www/
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| − | * mount | grep /dev/xvd
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| − | * ls /var/www/
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| − | * mkdir /var/www/html
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| − | * vi /var/www/html/index.php<source>
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| − | Hello. My web server still works.<br />
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| − | If this shows the current date and time, PHP works too:<br />
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| − | <?php system("date"); ?></source>
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| − | * chown -R andrew /var/www/html
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| − | * systemctl start httpd
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| − | * On router: iptables -t nat -I PREROUTING -p tcp --dport 80 -j DNAT --to 10.3.45.11:80
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| − | * On www: iptables -I INPUT 3 -p tcp --dport 80 -j ACCEPT
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| − | * service iptables save
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| − | * Edit security group, allow HTTP
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| − | * ss -atnp on router and www
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| − | * install php, restart httpd
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| − | * make proper html page:<source>
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| − | <html>
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| − | <head>
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| − | <style>
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| − | body {background-color: powderblue;}
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| − | table {border-spacing: 1cm 0cm;}
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| − | h2 {color: blue;}
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| − | th {text-align: left;}
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| − | p {color: red; font-weight: bold;}
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| − | </style>
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| − | </head>
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| − | <body>
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| − | Hello. My web server still works.<br />
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| − | If this shows the current date and time, PHP works too:<br /><br />
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| − | <?php system("date"); ?>
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| − | <h2>Instance Info</h2>
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| − | <table>
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| − | <tr><th>Configuration</th><th>Value</th></tr>
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| − | <tr>
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| − | <td><p>Private IP</p></td>
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| − | <td><?php system("curl http://169.254.169.254/latest/meta-data/local-ipv4"); ?></td>
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| − | </tr>
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| − | <tr>
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| − | <td><p>Public IP</p></td>
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| − | <td><?php system("curl http://169.254.169.254/latest/meta-data/public-ipv4"); ?></td>
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| − | </tr>
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| − | </table>
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| − | </body>
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| − | </html>
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| − | </source>
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| − | * Removing public ip doesn't work. Have to modify subnet and recreate the vm:
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| − | ** Terminate www, rename it to www-deleted.
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| − | ** Modify subnet to not auto-assign public IPs.
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| − | ** Recreate the www instance with the same steps, except specify a primary ip.
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| − | ** Install httpd, php
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| − | ** To get yum install to work, allocate a new elastic ip "temporary" and associate with www
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| − | ** Note that www-data was not deleted when the original www was terminated. Attach it to www now.
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| − | ** All the data on the logical volume is still there, but fstab is gone, add lv-www back into there.
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| − | ** Start httpd, everything should be back to as it was.
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| − | ** Disasociate the public ip. Everything should keep working.
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| − | ** Release the elastic ip.
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| − | * Add a 404 check for missing ip:
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| − | <source>
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| − | <?php
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| − | system("curl http://169.254.169.254/latest/meta-data/public-ipv4 2>&1| grep -q '404 - Not Found'", $rc);
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| − | if ($rc == 0)
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| − | echo "None found";
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| − | else
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| − | system("curl http://169.254.169.254/latest/meta-data/public-ipv4");
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| − | ?>
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| − | </source>
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| − | * If you feel curious you can see what other metadata you can get via http://169.254.169.254 here: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/instancedata-data-retrieval.html
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| − | * Move www to ops345sgprivate, and add port 80 from ops345sg as a second inbound rule there.
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