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virsh: Add keepalive in new vshConnect function

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Introducing keepalive similarly to Guannan around 2 years ago.  Since
we want to introduce keepalive for every connection, it makes sense to
wrap the connecting function into new virsh one that can deal
keepalive as well.

Function vshConnect() is now used for connecting and keepalive added
in that function (if possible) helps preventing long waits e.g. while
nework goes down during migration.

This patch also adds the options for keepalive tuning into virsh and
fails connecting only when keepalives are explicitly requested and
cannot be set (whether it is due to missing support in connected
driver or remote server).  If not explicitely requested, a debug
message is printed (hence the addition to virsh-optparse test).

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1073506
Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=822839

Signed-off-by: Martin Kletzander <mkletzan@redhat.com>
This commit is contained in:
Martin Kletzander 2014-03-06 17:20:11 +01:00
parent 29ea8a9b64
commit 676cb4f4e7
5 changed files with 94 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
tests/virsh-optparse
View File

@ -1,7 +1,7 @@
#!/bin/sh
# Ensure that virsh option parsing doesn't regress
# Copyright (C) 2011-2012 Red Hat, Inc.
# Copyright (C) 2011-2012, 2014 Red Hat, Inc.
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
@ -65,7 +65,7 @@ for args in \
'--count 2 test' \
'--count=2 test' \
; do
virsh -d0 -c $test_url setvcpus $args >out 2>>err || fail=1
virsh -k0 -d0 -c $test_url setvcpus $args >out 2>>err || fail=1
LC_ALL=C sort out | compare exp-out - || fail=1
done

2
tools/virsh-domain.c
View File

@ -8785,7 +8785,7 @@ doMigrate(void *opaque)
virConnectPtr dconn = NULL;
virDomainPtr ddom = NULL;
dconn = virConnectOpenAuth(desturi, virConnectAuthPtrDefault, 0);
dconn = vshConnect(ctl, desturi, false);
if (!dconn)
goto out;

81
tools/virsh.c
View File

@ -315,6 +315,46 @@ vshCatchDisconnect(virConnectPtr conn ATTRIBUTE_UNUSED,
disconnected++;
}
/* Main Function which should be used for connecting.
* This function properly handles keepalive settings. */
virConnectPtr
vshConnect(vshControl *ctl, const char *uri, bool readonly)
{
virConnectPtr c = NULL;
int interval = 5; /* Default */
int count = 6; /* Default */
bool keepalive_forced = false;
if (ctl->keepalive_interval >= 0) {
interval = ctl->keepalive_interval;
keepalive_forced = true;
}
if (ctl->keepalive_count >= 0) {
count = ctl->keepalive_count;
keepalive_forced = true;
}
c = virConnectOpenAuth(uri, virConnectAuthPtrDefault,
readonly ? VIR_CONNECT_RO : 0);
if (!c)
return NULL;
if (interval > 0 &&
virConnectSetKeepAlive(c, interval, count) != 0) {
if (keepalive_forced) {
vshError(ctl, "%s",
_("Cannot setup keepalive on connection "
"as requested, disconnecting"));
virConnectClose(c);
return NULL;
}
vshDebug(ctl, VSH_ERR_INFO, "%s",
_("Failed to setup keepalive on connection\n"));
}
return c;
}
/*
* vshReconnect:
*
@ -340,9 +380,8 @@ vshReconnect(vshControl *ctl)
"disconnect from the hypervisor"));
}
ctl->conn = virConnectOpenAuth(ctl->name,
virConnectAuthPtrDefault,
ctl->readonly ? VIR_CONNECT_RO : 0);
ctl->conn = vshConnect(ctl, ctl->name, ctl->readonly);
if (!ctl->conn) {
if (disconnected)
vshError(ctl, "%s", _("Failed to reconnect to the hypervisor"));
@ -417,8 +456,7 @@ cmdConnect(vshControl *ctl, const vshCmd *cmd)
ctl->useSnapshotOld = false;
ctl->readonly = ro;
ctl->conn = virConnectOpenAuth(ctl->name, virConnectAuthPtrDefault,
ctl->readonly ? VIR_CONNECT_RO : 0);
ctl->conn = vshConnect(ctl, ctl->name, ctl->readonly);
if (!ctl->conn) {
vshError(ctl, "%s", _("Failed to connect to the hypervisor"));
@ -3113,6 +3151,10 @@ vshUsage(void)
" -d | --debug=NUM debug level [0-4]\n"
" -e | --escape <char> set escape sequence for console\n"
" -h | --help this help\n"
" -k | --keepalive-interval=NUM\n"
" keepalive interval in seconds, 0 for disable\n"
" -K | --keepalive-count=NUM\n"
" number of possible missed keepalive messages\n"
" -l | --log=FILE output logging to file\n"
" -q | --quiet quiet mode\n"
" -r | --readonly connect readonly\n"
@ -3302,7 +3344,7 @@ vshAllowedEscapeChar(char c)
static bool
vshParseArgv(vshControl *ctl, int argc, char **argv)
{
int arg, len, debug;
int arg, len, debug, keepalive;
size_t i;
int longindex = -1;
struct option opt[] = {
@ -3310,6 +3352,8 @@ vshParseArgv(vshControl *ctl, int argc, char **argv)
{"debug", required_argument, NULL, 'd'},
{"escape", required_argument, NULL, 'e'},
{"help", no_argument, NULL, 'h'},
{"keepalive-interval", required_argument, NULL, 'k'},
{"keepalive-count", required_argument, NULL, 'K'},
{"log", required_argument, NULL, 'l'},
{"quiet", no_argument, NULL, 'q'},
{"readonly", no_argument, NULL, 'r'},
@ -3321,7 +3365,7 @@ vshParseArgv(vshControl *ctl, int argc, char **argv)
/* Standard (non-command) options. The leading + ensures that no
* argument reordering takes place, so that command options are
* not confused with top-level virsh options. */
while ((arg = getopt_long(argc, argv, "+:c:d:e:hl:qrtvV", opt, &longindex)) != -1) {
while ((arg = getopt_long(argc, argv, "+:c:d:e:hk:K:l:qrtvV", opt, &longindex)) != -1) {
switch (arg) {
case 'c':
VIR_FREE(ctl->name);
@ -3356,6 +3400,24 @@ vshParseArgv(vshControl *ctl, int argc, char **argv)
vshUsage();
exit(EXIT_SUCCESS);
break;
case 'k':
if (virStrToLong_i(optarg, NULL, 0, &keepalive) < 0 ||
keepalive < 0) {
vshError(ctl, _("option -%s requires a positive numeric argument"),
longindex == -1 ? "-k" : "--keepalive-interval");
exit(EXIT_FAILURE);
}
ctl->keepalive_interval = keepalive;
break;
case 'K':
if (virStrToLong_i(optarg, NULL, 0, &keepalive) < 0 ||
keepalive < 0) {
vshError(ctl, _("option -%s requires a positive numeric argument"),
longindex == -1 ? "-K" : "--keepalive-count");
exit(EXIT_FAILURE);
}
ctl->keepalive_count = keepalive;
break;
case 'l':
vshCloseLogFile(ctl);
ctl->logfile = vshStrdup(ctl, optarg);
@ -3490,6 +3552,11 @@ main(int argc, char **argv)
ctl->log_fd = -1; /* Initialize log file descriptor */
ctl->debug = VSH_DEBUG_DEFAULT;
ctl->escapeChar = "^]"; /* Same default as telnet */
/* In order to distinguish default from setting to 0 */
ctl->keepalive_interval = -1;
ctl->keepalive_count = -1;
ctl->eventPipe[0] = -1;
ctl->eventPipe[1] = -1;
ctl->eventTimerId = -1;

5
tools/virsh.h
View File

@ -249,6 +249,9 @@ struct _vshControl {
const char *escapeChar; /* String representation of
console escape character */
int keepalive_interval; /* Client keepalive interval */
int keepalive_count; /* Client keepalive count */
# ifndef WIN32
struct termios termattr; /* settings of the tty terminal */
# endif
@ -269,6 +272,8 @@ void vshOutputLogFile(vshControl *ctl, int log_level, const char *format,
ATTRIBUTE_FMT_PRINTF(3, 0);
void vshCloseLogFile(vshControl *ctl);
virConnectPtr vshConnect(vshControl *ctl, const char *uri, bool readonly);
const char *vshCmddefGetInfo(const vshCmdDef *cmd, const char *info);
const vshCmdDef *vshCmddefSearch(const char *cmdname);
bool vshCmddefHelp(vshControl *ctl, const char *name);

12
tools/virsh.pod
View File

@ -74,6 +74,18 @@ alphabetic character, @, [, ], \, ^, _.
Ignore all other arguments, and behave as if the B<help> command were
given instead.
=item B<-k>, B<--keepalive-interval> I<INTERVAL>
Set an I<INTERVAL> (in seconds) for sending keepalive messages to
check whether connection to the server is still alive. Setting the
interval to 0 disables client keepalive mechanism.
=item B<-K>, B<--keepalive-count> I<COUNT>
Set a number of times keepalive message can be sent without getting an
answer from the server without marking the connection dead. There is
no effect to this setting in case the I<INTERVAL> is set to 0.
=item B<-l>, B<--log> I<FILE>
Output logging details to I<FILE>.