Add git url for slides to last page
[obnox/slides/2016-04-vault.git] / witness.wiki
1 <[sambabg]
2
3 ==== ====[plain]
4
5 <[center]
6 \Large
7 '''Outlook: clustering / witness'''
8 [center]>
9
10 [frame]>
11 [sambabg]>
12
13 ==== Witness - General ====
14
15 * New DCE/RPC Service to “witness” availability of IPs, shares, ...
16 * ==> Faster fail-over of clients in the cluster
17 * Prompt, explicit, and controlled notifications about failures \ %
18   (CTDB tickle-ACKs are implicit)
19 * Available since SMB3 (Windows 8 / Windows Server 2012)
20
21 ==== Witness - Failover with SMB3 in a Samba/CTDB cluster ====
22
23 -<1>{
24 <[center]
25 <<<design-ctdb-three-nodes-with-witness-step0.png, width=.95\textwidth>>>
26 [center]>
27 }
28
29 -<2>{
30 <[center]
31 <<<design-ctdb-three-nodes-with-witness-step1.png, width=.95\textwidth>>>
32 [center]>
33 }
34
35 -<3>{
36 <[center]
37 <<<design-ctdb-three-nodes-with-witness-step2a.png, width=.95\textwidth>>>
38 [center]>
39 }
40
41 -<4>{
42 <[center]
43 <<<design-ctdb-three-nodes-with-witness-step2b.png, width=.95\textwidth>>>
44 [center]>
45 }
46
47 -<5>{
48 <[center]
49 <<<design-ctdb-three-nodes-with-witness-step3a.png, width=.95\textwidth>>>
50 [center]>
51 }
52
53 -<6>{
54 <[center]
55 <<<design-ctdb-three-nodes-with-witness-step3b.png, width=.95\textwidth>>>
56 [center]>
57 }
58
59 -<7>{
60 <[center]
61 <<<design-ctdb-three-nodes-with-witness-step4.png, width=.95\textwidth>>>
62 [center]>
63 }
64
65 -<8>{
66 <[center]
67 <<<design-ctdb-three-nodes-with-witness-step5.png, width=.95\textwidth>>>
68 [center]>
69 }
70
71 ==== Witness - Samba ====
72
73 <[block]{Currently under development in Samba}
74 * PoC implementation available
75 * TODO(wip): new _red_async_ DCE/RPC infrastructure
76 * {\footnotesize @https://wiki.samba.org/index.php/Samba3/ \\ %
77    SMB2\#Witness\_Notification\_Protocol@}
78 * WIP branch: \\ %
79   {\footnotesize @https://git.samba.org/?p=gd/samba/.git;a=shortlog; \\ %
80    h=refs/heads/master-witness@}
81 [block]>
82
83 <[block]{Samba Witness service will cause Windows clients to reconnect...}
84 * when client admin tool is used
85 * when CTDB (or any other cluster resource control manager) moves resources or IP addresses
86 [block]>
87
88 [frame]>
89