Over the course of the last 15 years, distributed denial of service attacks have established themselves both as a massive force for damage to communications and business and as a controversial form of speech. This week’s talk will discuss some of the history of politically motivated denial of service attacks while also describing the Deflect system, an open source DDoS mitigation platform for civil society and political organisations.
We’re happy to have a previous Netsoc member, Hugh (nosmo on IRC), giving this talk. It will be on Thursday 27th November at 6pm in the Maxwell Theatre. We hope you’ll come along to what promises to be an interesting talk!
In preparation of our services server, snark, being shut down tomorrow for the weekend we need to restart our login server, cube. This is to allow our contingency services solution to take effect. We will not need to restart spoon, however.
Moreover to migrate our services we will need to take them offline one-by-one as we transfer them. This means that there will be a small window of downtime for IRC, LDAP (logging in will be affected by this), our main website/wiki/etc., and our mailing lists. This is planned for around 10pm tonight, and we’ll advertise the IRC downtime on IRC in advance.
On Monday, when snark is brought back online there will also be downtime for these same services as we migrate them back onto snark. Again it will probably be around 6-10pm on Monday when this is done. We do not plan on restarting cube on Monday though. However it will be shut down once we get the replacement disk for its degraded RAID (and hopefully this time the replacement won’t be faulty!).
The hard drive that was meant to replace the faulty drive in cube is, frustratingly, faulty! It’s being sent back, and hopefully we’ll have a replacement by the end of this week. Unfortunately this coincides with the downtime of snark (reminder: user websites will be unavailable between Friday 21st and Monday 24th). So once the new disk arrives, and the network in TCHPC is no longer down we will install the new disk.
Cube will be turned off for a couple of hours tonight as we (finally) replace the disk that died last week. It will be turned off at about 22:00 tonigh, with the aim of it being back online at around midnight.
The reason for the prolonged downtime is because we need to prepare for our services server, snark, being turned off this weekend. This is happening because the place where we host it (Trinity Centre for High Performance Computing) is doing major work to their machine room and the network will be down for that weekend.
We are planning to run a temporary services system during this weekend, so you will still be able to log in to cube and spoon. However we will not be able to serve the user websites for that weekend. IRC, email, and logins should still be available with a small interruption on Friday morning when we transfer the services over. There will also be a small interruption on Monday afternoon once we get the all-clear from TCHPC. For the rest of next week our services server will be in an ‘at-risk’ state because of the work going on in the machine room, but we hope there will not be any further downtime.
If anybody is interested in learning about how we manage our systems, email firstname.lastname@example.org or come along to our sysadmin talks on each Monday in the Samuel Beckett PC Lab A in the Arts building at 6pm!
Cube is back up and running after one of its drives decided to give up working. Currently the user home directories are effectively running on one disk, so if that disk were to die then all the data would be gone. Now would be a good time to backup your data on cube. We’re in the process of getting a replacement drive and once we do will will be shutting cube down to install it. We’ll have more information about when this downtime will be, but it should be around the end of this week or the beginning of the next.
The disk that died was the last of the original hard disks that came with cube, so we’re hoping that the replacements will be able to last for a good few years before they start giving out. This also means that cube will (hopefully!) be somewhat more stable once the new disk is put in.