On the second day, Slurm already felt a slight fatigue of the participants. It’s good that Aleksey Gladkikh, a specialist in conferences and mass gatherings, such as the Battle of Kulikovo and the Bloody Wedding in Game of Thrones, helped us. Both there and there the movement got active, no one stayed up, the blood did not stagnate.
On the second day of Slurm, Pavel Selivanov raised the topics of advanced abstractions Kubernetes: DaemonSet, StatefulSet, RBAC, Job, CronJob, Pod Scheduling, InitContainer.
After coffeebreaking, Marcel Ibraev and the DNS in the cluster went very well, and at the same time publishing services and applications - NodePort vs LoadBalancer vs Ingress.
Thanks to Alexey Gladkikh - he did not let the spines turn into an addition to the backs of chairs. At Alexey, this is called "business workouts." That the heads did not fail in one state and there was a switch between training, practice and various cool workouts. "Greetings from Cherchesov." "Brazilian rain." "Thirty three". In total, 18 exercises are planned for three days of intense.
“- But the Tsar is not real!”
Here you try to quickly grasp the left ear with the right hand, the right hand with the nose. Clap your hands in a second. And immediately grab the left ear with your right hand and the nose with your left hand. And repeat. After that, raising ceph to work with Kubernetes is just bullshit.
Then, with a tenacious hand, Pavel Selivanov took up the audience. He began by working with Helm, writing his own charts.
And then the same Ceph appeared under the command of Sergey Bondarev: installation in the “do as I” mode, connecting volumes to the pods, and of course sc, pvc, pv - a practice using Ceph as an example.
There were timid exclamations in the hall that there were problems. A few hands went up. Sergey Bondarev replied: “Now we’ll come and solve the problem.” Then a voice came from the depths of the hall: "No man - no problem." The number of hands sharply decreased. Effective bug management.
- Did you say that you have a problem? - No, no, no, everything is fine with me and everything works!
Technical support demonstrated the wonders of professionalism. Not a single question, not a single problem passed by them.
At such moments, each participant understands that he will not be left alone. Moreover, ahead of the third day of Slurm is the most difficult, most interesting and peppy. Practical work, dockerization of the application and launch into the cluster.