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1 | a8083063 | Iustin Pop | <!doctype refentry PUBLIC "-//OASIS//DTD DocBook V4.1//EN" [ |
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2 | a8083063 | Iustin Pop | |
3 | a8083063 | Iustin Pop | <!-- Fill in your name for FIRSTNAME and SURNAME. --> |
4 | a8083063 | Iustin Pop | <!-- Please adjust the date whenever revising the manpage. --> |
5 | a8083063 | Iustin Pop | <!ENTITY dhdate "<date>June 20, 2007</date>"> |
6 | a8083063 | Iustin Pop | <!-- SECTION should be 1-8, maybe w/ subsection other parameters are |
7 | a8083063 | Iustin Pop | allowed: see man(7), man(1). --> |
8 | a8083063 | Iustin Pop | <!ENTITY dhsection "<manvolnum>8</manvolnum>"> |
9 | a8083063 | Iustin Pop | <!ENTITY dhucpackage "<refentrytitle>ganeti-watcher</refentrytitle>"> |
10 | a8083063 | Iustin Pop | <!ENTITY dhpackage "ganeti-watcher"> |
11 | a8083063 | Iustin Pop | |
12 | a8083063 | Iustin Pop | <!ENTITY debian "<productname>Debian</productname>"> |
13 | a8083063 | Iustin Pop | <!ENTITY gnu "<acronym>GNU</acronym>"> |
14 | a8083063 | Iustin Pop | <!ENTITY gpl "&gnu; <acronym>GPL</acronym>"> |
15 | a8083063 | Iustin Pop | <!ENTITY footer SYSTEM "footer.sgml"> |
16 | a8083063 | Iustin Pop | ]> |
17 | a8083063 | Iustin Pop | |
18 | a8083063 | Iustin Pop | <refentry> |
19 | a8083063 | Iustin Pop | <refentryinfo> |
20 | a8083063 | Iustin Pop | <copyright> |
21 | a8083063 | Iustin Pop | <year>2007</year> |
22 | a8083063 | Iustin Pop | <holder>Google Inc.</holder> |
23 | a8083063 | Iustin Pop | </copyright> |
24 | a8083063 | Iustin Pop | &dhdate; |
25 | a8083063 | Iustin Pop | </refentryinfo> |
26 | a8083063 | Iustin Pop | <refmeta> |
27 | a8083063 | Iustin Pop | &dhucpackage; |
28 | a8083063 | Iustin Pop | |
29 | a8083063 | Iustin Pop | &dhsection; |
30 | a8083063 | Iustin Pop | <refmiscinfo>ganeti 1.2</refmiscinfo> |
31 | a8083063 | Iustin Pop | </refmeta> |
32 | a8083063 | Iustin Pop | <refnamediv> |
33 | a8083063 | Iustin Pop | <refname>&dhpackage;</refname> |
34 | a8083063 | Iustin Pop | |
35 | a8083063 | Iustin Pop | <refpurpose>ganeti cluster watcher</refpurpose> |
36 | a8083063 | Iustin Pop | </refnamediv> |
37 | a8083063 | Iustin Pop | <refsynopsisdiv> |
38 | a8083063 | Iustin Pop | <cmdsynopsis> |
39 | a8083063 | Iustin Pop | <command>&dhpackage; </command> |
40 | a8083063 | Iustin Pop | |
41 | a8083063 | Iustin Pop | </cmdsynopsis> |
42 | a8083063 | Iustin Pop | </refsynopsisdiv> |
43 | a8083063 | Iustin Pop | <refsect1> |
44 | a8083063 | Iustin Pop | <title>DESCRIPTION</title> |
45 | a8083063 | Iustin Pop | |
46 | a8083063 | Iustin Pop | <para> |
47 | a8083063 | Iustin Pop | The <command>&dhpackage;</command> is a periodically run script |
48 | a8083063 | Iustin Pop | which is responsible for keeping the instances in the correct |
49 | a8083063 | Iustin Pop | status. |
50 | a8083063 | Iustin Pop | </para> |
51 | a8083063 | Iustin Pop | |
52 | a8083063 | Iustin Pop | <para> |
53 | a8083063 | Iustin Pop | Its function is to try to keep running all instances which are |
54 | a8083063 | Iustin Pop | marked as <emphasis>up</emphasis> in the configuration file, by |
55 | a8083063 | Iustin Pop | trying to start them a limited number of times. |
56 | a8083063 | Iustin Pop | </para> |
57 | a8083063 | Iustin Pop | |
58 | a8083063 | Iustin Pop | <para>In order to prevent piling up commands, all the |
59 | a8083063 | Iustin Pop | <emphasis>gnt-*</emphasis> commands executed by ganeti-watcher are |
60 | a8083063 | Iustin Pop | run with a timeout of 15 seconds. |
61 | a8083063 | Iustin Pop | </para> |
62 | a8083063 | Iustin Pop | |
63 | a8083063 | Iustin Pop | <para> |
64 | a8083063 | Iustin Pop | The command has a state file located at |
65 | a8083063 | Iustin Pop | <filename>/var/lib/ganeti/restart_state</filename> and a log |
66 | a8083063 | Iustin Pop | file at |
67 | a8083063 | Iustin Pop | <filename>/var/log/ganeti/watcher.log</filename>. Removal of |
68 | a8083063 | Iustin Pop | either file will not affect correct operation; the removal of |
69 | a8083063 | Iustin Pop | the state file will just cause the restart counters for the |
70 | a8083063 | Iustin Pop | instances to reset to zero. |
71 | a8083063 | Iustin Pop | </para> |
72 | a8083063 | Iustin Pop | |
73 | a8083063 | Iustin Pop | </refsect1> |
74 | a8083063 | Iustin Pop | |
75 | a8083063 | Iustin Pop | <refsect1> |
76 | a8083063 | Iustin Pop | <title>KNOWN BUGS</title> |
77 | a8083063 | Iustin Pop | |
78 | a8083063 | Iustin Pop | <para> |
79 | a8083063 | Iustin Pop | Due to the way we initialize DRBD peers, restarting a secondary |
80 | a8083063 | Iustin Pop | node for an instance will cause the DRBD endpoints on that node |
81 | a8083063 | Iustin Pop | to disappear, thus all instances which have that node as a |
82 | a8083063 | Iustin Pop | secondary will lose redundancy. The watcher does not detect this |
83 | a8083063 | Iustin Pop | situation. The workaround is to manually run |
84 | a8083063 | Iustin Pop | <command>gnt-instance activate-disks</command> for all the |
85 | a8083063 | Iustin Pop | affected instances. |
86 | a8083063 | Iustin Pop | </para> |
87 | a8083063 | Iustin Pop | </refsect1> |
88 | a8083063 | Iustin Pop | |
89 | a8083063 | Iustin Pop | &footer; |
90 | a8083063 | Iustin Pop | |
91 | a8083063 | Iustin Pop | </refentry> |
92 | a8083063 | Iustin Pop | |
93 | a8083063 | Iustin Pop | <!-- Keep this comment at the end of the file |
94 | a8083063 | Iustin Pop | Local variables: |
95 | a8083063 | Iustin Pop | mode: sgml |
96 | a8083063 | Iustin Pop | sgml-omittag:t |
97 | a8083063 | Iustin Pop | sgml-shorttag:t |
98 | a8083063 | Iustin Pop | sgml-minimize-attributes:nil |
99 | a8083063 | Iustin Pop | sgml-always-quote-attributes:t |
100 | a8083063 | Iustin Pop | sgml-indent-step:2 |
101 | a8083063 | Iustin Pop | sgml-indent-data:t |
102 | a8083063 | Iustin Pop | sgml-parent-document:nil |
103 | a8083063 | Iustin Pop | sgml-default-dtd-file:nil |
104 | a8083063 | Iustin Pop | sgml-exposed-tags:nil |
105 | a8083063 | Iustin Pop | sgml-local-catalogs:nil |
106 | a8083063 | Iustin Pop | sgml-local-ecat-files:nil |
107 | a8083063 | Iustin Pop | End: |
108 | a8083063 | Iustin Pop | --> |