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For RU wide service interruption see meldingen.ru.nl.
Yesterday the SSD bootdisk of this VM host reported the first problems. This morning this had the effect of stopping all VMs running on this host. By moving the VMs to a different VM host, the problem has been solved. We will investigate how to best prevent this problem in the future or lessen its impact.
The ISC announced that Saturday February 27 08:00-20:00 major RU network maintenance work will be carried out. This will mean that all RU services will be unavailable several times for at most an hour. This concerns all RU services including those of FNWI/C&CZ: e-mail, VPN, wifi, BASS, OSIRIS, Brightspace, Syllabus+, Corsa, etc.
As of Thursday afternoon, the lilo6 is down due to hardware issues. Because lilo6 was the default linux login server (lilo referred to lilo6), this affected many users of lilo. The impact is limited, because we have alternative lilo’s, namely lilo5 and lilo7. As of March 1st lilo now refers to lilo7, ssh will warn about DNS SPOOFING, which is due to the difference host keys for lilo7 ECDSA SHA256:si3g2elo5m6TShx3PjX0+vF50pZ8NK/iXz/ESB+ZeP0
The central DNS servers for ru.nl for external requests had problems, because they received too many requests, which resulted in science.ru.nl and others not being found. DNS names within ru.nl then will not resolve to an IP address. We enlarged some TTLs (Time-To+lives) to try to lessen the problem. These small TTLs were meant to be able to move a service to a new server in case of problems, but now they just make the problem bigger....
DNS-servers for ru.nl did not serve information about subdomains such as science.ru.nl. Thus no DNS-name will resolve to an IP address at FNWI. A workaround is to use as DNS servers: 131.174.224.4 en 8.8.8.8. If you try to connect to a service for the first time after ca 11:15, you’ll get an error like: “No such domain” or “Cannot resolve”. Restarting RU DNS servers at 12:45 may have fixed the problem....
Services will not be available for a while because of a GitLab and Mattermost upgrade.
The expiration date of the certificate of our VPNsec service was apparently not yet checked regularly. This made it possible for the certificate to expire. We put a new certificate into place within an hour. Of course we will check this certificate regularly from now on. For Apple/Mac we needed to construct a new mobileconfig, this took some time, because in the meantime RU had moved to a different Certificate Authority....
medewerkers, studenten Due to a management operation (planned around this time), the DIY website was unusable. Since the time was very early, it’s expected nobody was inconvenienced by this temporary unavailability.
medewerkers, studenten A configuration change unwantedly made the smtp service unusable. When we noticed this, it was repaired immediately.
medewerkers, studenten A configuration change had as unwanted effect the disappearance of all very long mail aliases. When this was reported next morning, it was repaired immediately.