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Create lxc_controller standalone binary

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This commit is contained in:
Daniel P. Berrange 2008-08-20 20:55:32 +00:00
parent bb16f4a25d
commit 177c74b1fa
7 changed files with 372 additions and 186 deletions
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9
ChangeLog
View File

@ -1,3 +1,12 @@
Wed Aug 20 21:50:09 BST 2008 Daniel P. Berrange <berrange@redhat.com>
* src/domain_conf.c: Include PTY name if available
* src/Makefile.am: Add lxc_controller binary
* src/lxc_conf.c, src/lxc_conf.h, src/lxc_controller.c,
src/lxc_controller.h, src/lxc_driver.c: Move LXC controller
into a properly exec'd binary, instead of fork'd child of
libvirtd daemon
Wed Aug 20 21:05:09 BST 2008 Daniel P. Berrange <berrange@redhat.com>
* configure.in, qemud/Makefile.am, src/Makefile.am: Use automake

26
src/Makefile.am
View File

@ -88,10 +88,15 @@ XEN_DRIVER_SOURCES = \
LXC_DRIVER_SOURCES = \
lxc_conf.c lxc_conf.h \
lxc_container.c lxc_container.h \
lxc_controller.c lxc_controller.h \
lxc_driver.c lxc_driver.h \
veth.c veth.h
LXC_CONTROLLER_SOURCES = \
lxc_conf.c lxc_conf.h \
lxc_container.c lxc_container.h \
lxc_controller.c \
veth.c veth.h
OPENVZ_DRIVER_SOURCES = \
openvz_conf.c openvz_conf.h \
openvz_driver.c openvz_driver.h
@ -272,9 +277,11 @@ virsh-pool-edit.c: virsh.c Makefile.am
rm -f $@
mv $@-tmp $@
libexec_PROGRAMS =
if WITH_STORAGE_DISK
if WITH_LIBVIRTD
libexec_PROGRAMS = libvirt_parthelper
libexec_PROGRAMS += libvirt_parthelper
libvirt_parthelper_SOURCES = $(STORAGE_HELPER_DISK_SOURCES)
libvirt_parthelper_LDFLAGS = $(WARN_CFLAGS) $(COVERAGE_LDCFLAGS)
@ -285,6 +292,21 @@ endif
EXTRA_DIST += $(STORAGE_HELPER_DISK_SOURCES)
if WITH_LXC
if WITH_LIBVIRTD
libexec_PROGRAMS += libvirt_lxc
libvirt_lxc_SOURCES = \
$(LXC_CONTROLLER_SOURCES) \
$(GENERIC_LIB_SOURCES) \
$(DOMAIN_CONF_SOURCES)
libvirt_lxc_LDFLAGS = $(WARN_CFLAGS) $(COVERAGE_LDCFLAGS)
libvirt_lxc_LDADD = $(LIBXML_LIBS) ../gnulib/lib/libgnu.la
libvirt_lxc_CFLAGS = $(LIBPARTED_CFLAGS)
endif
endif
EXTRA_DIST += $(LXC_CONTROLLER_SOURCES)
# Create the /var/cache/libvirt directory when installing.
install-exec-local:
$(MKDIR_P) $(DESTDIR)$(localstatedir)/cache/libvirt

6
src/domain_conf.c
View File

@ -1109,13 +1109,11 @@ virDomainChrDefParseXML(virConnectPtr conn,
break;
case VIR_DOMAIN_CHR_TYPE_PTY:
/* @path attribute is an output only property - pty is auto-allocted */
break;
case VIR_DOMAIN_CHR_TYPE_DEV:
case VIR_DOMAIN_CHR_TYPE_FILE:
case VIR_DOMAIN_CHR_TYPE_PIPE:
if (path == NULL) {
if (path == NULL &&
def->type != VIR_DOMAIN_CHR_TYPE_PTY) {
virDomainReportError(conn, VIR_ERR_INTERNAL_ERROR,
"%s", _("Missing source path attribute for char device"));
goto error;

8
src/lxc_conf.c
View File

@ -71,7 +71,7 @@ virCapsPtr lxcCapsInit(void)
"exe",
utsname.machine,
sizeof(int) == 4 ? 32 : 8,
NULL,
BINDIR "/libvirt_lxc",
NULL,
0,
NULL)) == NULL)
@ -94,11 +94,11 @@ no_memory:
int lxcLoadDriverConfig(lxc_driver_t *driver)
{
/* Set the container configuration directory */
if ((driver->configDir = strdup(SYSCONF_DIR "/libvirt/lxc")) == NULL)
if ((driver->configDir = strdup(LXC_CONFIG_DIR)) == NULL)
goto no_memory;
if ((driver->stateDir = strdup(LOCAL_STATE_DIR "/run/libvirt/lxc")) == NULL)
if ((driver->stateDir = strdup(LXC_STATE_DIR)) == NULL)
goto no_memory;
if ((driver->logDir = strdup(LOCAL_STATE_DIR "/log/libvirt/lxc")) == NULL)
if ((driver->logDir = strdup(LXC_LOG_DIR)) == NULL)
goto no_memory;
return 0;

4
src/lxc_conf.h
View File

@ -30,6 +30,10 @@
#include "domain_conf.h"
#include "capabilities.h"
#define LXC_CONFIG_DIR SYSCONF_DIR "/libvirt/lxc"
#define LXC_STATE_DIR LOCAL_STATE_DIR "/run/libvirt/lxc"
#define LXC_LOG_DIR LOCAL_STATE_DIR "/log/libvirt/lxc"
typedef struct __lxc_driver lxc_driver_t;
struct __lxc_driver {
virCapsPtr caps;

314
src/lxc_controller.c
View File

@ -23,22 +23,22 @@
#include <config.h>
#ifdef WITH_LXC
#include <sys/epoll.h>
#include <sys/wait.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/un.h>
#include <unistd.h>
#include <paths.h>
#include <fcntl.h>
#include <signal.h>
#include <getopt.h>
#include "internal.h"
#include "util.h"
#include "lxc_conf.h"
#include "lxc_container.h"
#include "lxc_controller.h"
#include "veth.h"
#include "memory.h"
#include "util.h"
@ -47,6 +47,56 @@
#define DEBUG(fmt,...) VIR_DEBUG(__FILE__, fmt, __VA_ARGS__)
#define DEBUG0(msg) VIR_DEBUG(__FILE__, "%s", msg)
int debugFlag = 0;
static char*lxcMonitorPath(virDomainDefPtr def)
{
char *sockpath;
if (asprintf(&sockpath, "%s/%s.sock",
LXC_STATE_DIR, def->name) < 0) {
lxcError(NULL, NULL, VIR_ERR_NO_MEMORY, NULL);
return NULL;
}
return sockpath;
}
static int lxcMonitorServer(const char *sockpath)
{
int fd;
struct sockaddr_un addr;
if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) {
lxcError(NULL, NULL, VIR_ERR_INTERNAL_ERROR,
_("failed to create server socket %s: %s"),
sockpath, strerror(errno));
goto error;
}
unlink(sockpath);
memset(&addr, 0, sizeof(addr));
addr.sun_family = AF_UNIX;
strncpy(addr.sun_path, sockpath, sizeof(addr.sun_path));
if (bind(fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
lxcError(NULL, NULL, VIR_ERR_INTERNAL_ERROR,
_("failed to bind server socket %s: %s"),
sockpath, strerror(errno));
goto error;
}
if (listen(fd, 30 /* backlog */ ) < 0) {
lxcError(NULL, NULL, VIR_ERR_INTERNAL_ERROR,
_("failed to listen server socket %s: %s"),
sockpath, strerror(errno));
goto error;
}
return fd;
error:
if (fd != -1)
close(fd);
return -1;
}
/**
* lxcFdForward:
@ -305,8 +355,7 @@ static int lxcControllerCleanupInterfaces(unsigned int nveths,
static int
lxcControllerRun(const char *stateDir,
virDomainDefPtr def,
lxcControllerRun(virDomainDefPtr def,
unsigned int nveths,
char **veths,
int monitor,
@ -359,148 +408,187 @@ cleanup:
if (containerPty != -1)
close(containerPty);
kill(container, SIGTERM);
waitpid(container, NULL, 0);
lxcControllerCleanupInterfaces(nveths, veths);
virFileDeletePid(stateDir, def->name);
if (container > 1) {
kill(container, SIGTERM);
waitpid(container, NULL, 0);
}
return rc;
}
int lxcControllerStart(const char *stateDir,
virDomainDefPtr def,
unsigned int nveths,
char **veths,
int monitor,
int appPty,
int logfd)
int main(int argc, char *argv[])
{
pid_t pid;
int rc;
int status, null;
int open_max, i;
int rc = 1;
int client;
struct sigaction sig_action;
char *name = NULL;
int nveths = 0;
char **veths = NULL;
int monitor = -1;
int appPty = -1;
int bg = 0;
virCapsPtr caps = NULL;
virDomainDefPtr def = NULL;
int nnets = 0;
virDomainNetDefPtr nets = NULL;
char *configFile = NULL;
char *sockpath = NULL;
const struct option const options[] = {
{ "background", 0, NULL, 'b' },
{ "name", 1, NULL, 'n' },
{ "veth", 1, NULL, 'v' },
{ "console", 1, NULL, 'c' },
{ "help", 0, NULL, 'h' },
{ 0, 0, 0, 0 },
};
if ((pid = fork()) < 0)
return -1;
while (1) {
int c;
if (pid > 0) {
/* Original caller waits for first child to exit */
while (1) {
rc = waitpid(pid, &status, 0);
if (rc < 0) {
if (errno == EINTR)
continue;
return -1;
c = getopt_long(argc, argv, "dn:v:m:c:h",
options, NULL);
if (c == -1)
break;
switch (c) {
case 'b':
bg = 1;
break;
case 'n':
if ((name = strdup(optarg)) == NULL) {
fprintf(stderr, "%s", strerror(errno));
goto cleanup;
}
if (rc != pid) {
fprintf(stderr,
_("Unexpected pid %d != %d from waitpid\n"),
rc, pid);
return -1;
break;
case 'v':
if (VIR_REALLOC_N(veths, nveths+1) < 0) {
fprintf(stderr, "cannot allocate veths %s", strerror(errno));
goto cleanup;
}
if (WIFEXITED(status) &&
WEXITSTATUS(status) == 0)
return 0;
else {
fprintf(stderr,
_("Unexpected status %d from pid %d\n"),
status, pid);
return -1;
if ((veths[nveths++] = strdup(optarg)) == NULL) {
fprintf(stderr, "cannot allocate veth name %s", strerror(errno));
goto cleanup;
}
break;
case 'c':
if (virStrToLong_i(optarg, NULL, 10, &appPty) < 0) {
fprintf(stderr, "malformed --console argument '%s'", optarg);
goto cleanup;
}
break;
case 'h':
case '?':
fprintf(stderr, "\n");
fprintf(stderr, "syntax: %s [OPTIONS]\n", argv[0]);
fprintf(stderr, "\n");
fprintf(stderr, "Options\n");
fprintf(stderr, "\n");
fprintf(stderr, " -b, --background\n");
fprintf(stderr, " -n NAME, --name NAME\n");
fprintf(stderr, " -c FD, --console FD\n");
fprintf(stderr, " -v VETH, --veth VETH\n");
fprintf(stderr, " -h, --help\n");
fprintf(stderr, "\n");
goto cleanup;
}
}
/* First child is running here */
/* Clobber all libvirtd's signal handlers so they
* don't affect us
*/
sig_action.sa_handler = SIG_DFL;
sig_action.sa_flags = 0;
sigemptyset(&sig_action.sa_mask);
sigaction(SIGHUP, &sig_action, NULL);
sigaction(SIGINT, &sig_action, NULL);
sigaction(SIGQUIT, &sig_action, NULL);
sigaction(SIGTERM, &sig_action, NULL);
sigaction(SIGCHLD, &sig_action, NULL);
sig_action.sa_handler = SIG_IGN;
sigaction(SIGPIPE, &sig_action, NULL);
/* Don't hold onto any cwd we inherit from libvirtd either */
if (chdir("/") < 0) {
fprintf(stderr, _("Unable to change to root dir: %s\n"),
strerror(errno));
_exit(-1);
if (name == NULL) {
fprintf(stderr, "%s: missing --name argument for configuration\n", argv[0]);
goto cleanup;
}
if (setsid() < 0) {
fprintf(stderr, _("Unable to become session leader: %s\n"),
strerror(errno));
_exit(-1);
if (appPty < 0) {
fprintf(stderr, "%s: missing --console argument for container PTY\n", argv[0]);
goto cleanup;
}
if ((null = open(_PATH_DEVNULL, O_RDONLY)) < 0) {
fprintf(stderr, _("Unable to open %s: %s\n"),
_PATH_DEVNULL, strerror(errno));
_exit(-1);
if (getuid() && 0) {
fprintf(stderr, "%s: must be run as the 'root' user\n", argv[0]);
goto cleanup;
}
open_max = sysconf (_SC_OPEN_MAX);
for (i = 0; i < open_max; i++)
if (i != appPty &&
i != monitor &&
i != logfd &&
i != null)
close(i);
if ((caps = lxcCapsInit()) == NULL)
goto cleanup;
if (dup2(null, STDIN_FILENO) < 0 ||
dup2(logfd, STDOUT_FILENO) < 0 ||
dup2(logfd, STDERR_FILENO) < 0) {
fprintf(stderr, _("Unable to redirect stdio: %s\n"),
strerror(errno));
_exit(-1);
if ((configFile = virDomainConfigFile(NULL,
LXC_STATE_DIR,
name)) == NULL)
goto cleanup;
if ((def = virDomainDefParseFile(NULL, caps, configFile)) == NULL)
goto cleanup;
nets = def->nets;
while (nets) {
nnets++;
nets = nets->next;
}
if (nnets != nveths) {
fprintf(stderr, "%s: expecting %d veths, but got %d\n",
argv[0], nnets, nveths);
goto cleanup;
}
close(null);
close(logfd);
if ((sockpath = lxcMonitorPath(def)) == NULL)
goto cleanup;
/* Now fork the real controller process */
if ((pid = fork()) < 0) {
fprintf(stderr, _("Unable to fork controller: %s\n"),
strerror(errno));
_exit(-1);
}
if ((monitor = lxcMonitorServer(sockpath)) < 0)
goto cleanup;
if (pid > 0) {
if ((rc = virFileWritePid(stateDir, def->name, pid)) != 0) {
fprintf(stderr, _("Unable to write pid file: %s\n"),
strerror(rc));
_exit(-1);
if (bg) {
if ((pid = fork()) < 0)
goto cleanup;
if (pid > 0) {
if ((rc = virFileWritePid(LXC_STATE_DIR, name, pid)) != 0) {
fprintf(stderr, _("Unable to write pid file: %s\n"),
strerror(rc));
_exit(1);
}
/* First child now exits, allowing original caller
* (ie libvirtd's LXC driver to complete their
* waitpid & continue */
_exit(0);
}
/* First child now exits, allowing originall caller to
* complete their waitpid & continue */
_exit(0);
}
/* This is real controller running finally... */
/* Don't hold onto any cwd we inherit from libvirtd either */
if (chdir("/") < 0) {
fprintf(stderr, _("Unable to change to root dir: %s\n"),
strerror(errno));
goto cleanup;
}
if (setsid() < 0) {
fprintf(stderr, _("Unable to become session leader: %s\n"),
strerror(errno));
goto cleanup;
}
}
/* Accept initial client which is the libvirtd daemon */
if ((client = accept(monitor, NULL, 0))) {
if ((client = accept(monitor, NULL, 0)) < 0) {
fprintf(stderr, _("Failed connection from LXC driver: %s\n"),
strerror(errno));
_exit(-1);
goto cleanup;
}
/* Controlling libvirtd LXC driver now knows
what our PID is, and is able to cleanup after
us from now on */
_exit(lxcControllerRun(stateDir, def, nveths, veths, monitor, client, appPty));
rc = lxcControllerRun(def, nveths, veths, monitor, client, appPty);
cleanup:
virFileDeletePid(LXC_STATE_DIR, def->name);
lxcControllerCleanupInterfaces(nveths, veths);
unlink(sockpath);
VIR_FREE(sockpath);
return rc;
}
#endif

191
src/lxc_driver.c
View File

@ -38,7 +38,6 @@
#include "lxc_conf.h"
#include "lxc_container.h"
#include "lxc_driver.h"
#include "lxc_controller.h"
#include "memory.h"
#include "util.h"
#include "bridge.h"
@ -398,6 +397,7 @@ static int lxcVMCleanup(virConnectPtr conn,
close(vm->monitor);
virFileDeletePid(driver->stateDir, vm->def->name);
virDomainDeleteConfig(conn, driver->stateDir, NULL, vm);
vm->state = VIR_DOMAIN_SHUTOFF;
vm->pid = -1;
@ -507,55 +507,6 @@ error_exit:
return rc;
}
static int lxcMonitorServer(virConnectPtr conn,
lxc_driver_t * driver,
virDomainObjPtr vm)
{
char *sockpath = NULL;
int fd;
struct sockaddr_un addr;
if (asprintf(&sockpath, "%s/%s.sock",
driver->stateDir, vm->def->name) < 0) {
lxcError(conn, NULL, VIR_ERR_NO_MEMORY, NULL);
return -1;
}
if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) {
lxcError(conn, NULL, VIR_ERR_INTERNAL_ERROR,
_("failed to create server socket: %s"),
strerror(errno));
goto error;
}
unlink(sockpath);
memset(&addr, 0, sizeof(addr));
addr.sun_family = AF_UNIX;
strncpy(addr.sun_path, sockpath, sizeof(addr.sun_path));
if (bind(fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
lxcError(conn, NULL, VIR_ERR_INTERNAL_ERROR,
_("failed to bind server socket: %s"),
strerror(errno));
goto error;
}
if (listen(fd, 30 /* backlog */ ) < 0) {
lxcError(conn, NULL, VIR_ERR_INTERNAL_ERROR,
_("failed to listen server socket: %s"),
strerror(errno));
goto error;
return (-1);
}
VIR_FREE(sockpath);
return fd;
error:
VIR_FREE(sockpath);
if (fd != -1)
close(fd);
return -1;
}
static int lxcMonitorClient(virConnectPtr conn,
lxc_driver_t * driver,
@ -608,6 +559,12 @@ static int lxcVmTerminate(virConnectPtr conn,
if (signum == 0)
signum = SIGINT;
if (vm->pid <= 0) {
lxcError(conn, NULL, VIR_ERR_INTERNAL_ERROR,
_("invalid PID %d for container"), vm->pid);
return -1;
}
if (kill(vm->pid, signum) < 0) {
if (errno != ESRCH) {
lxcError(conn, NULL, VIR_ERR_INTERNAL_ERROR,
@ -644,6 +601,102 @@ static void lxcMonitorEvent(int fd,
}
static int lxcControllerStart(virConnectPtr conn,
virDomainObjPtr vm,
int nveths,
char **veths,
int appPty,
int logfd)
{
int i;
int rc;
int ret = -1;
int largc = 0, larga = 0;
const char **largv = NULL;
pid_t child;
int status;
#define ADD_ARG_SPACE \
do { \
if (largc == larga) { \
larga += 10; \
if (VIR_REALLOC_N(largv, larga) < 0) \
goto no_memory; \
} \
} while (0)
#define ADD_ARG(thisarg) \
do { \
ADD_ARG_SPACE; \
largv[largc++] = thisarg; \
} while (0)
#define ADD_ARG_LIT(thisarg) \
do { \
ADD_ARG_SPACE; \
if ((largv[largc++] = strdup(thisarg)) == NULL) \
goto no_memory; \
} while (0)
ADD_ARG_LIT(vm->def->emulator);
ADD_ARG_LIT("--name");
ADD_ARG_LIT(vm->def->name);
ADD_ARG_LIT("--console");
ADD_ARG_LIT("0"); /* Passing console master PTY as FD 0 */
ADD_ARG_LIT("--background");
for (i = 0 ; i < nveths ; i++) {
ADD_ARG_LIT("--veth");
ADD_ARG_LIT(veths[i]);
}
ADD_ARG(NULL);
vm->stdin_fd = appPty; /* Passing console master PTY as FD 0 */
vm->stdout_fd = vm->stderr_fd = logfd;
if (virExec(conn, largv, NULL, &child,
vm->stdin_fd, &vm->stdout_fd, &vm->stderr_fd,
VIR_EXEC_NONE) < 0)
goto cleanup;
/* We now wait for the process to exit - the controller
* will fork() itself into the background - waiting for
* it to exit thus guarentees it has written its pidfile
*/
while ((rc = waitpid(child, &status, 0) == -1) && errno == EINTR);
if (rc == -1) {
lxcError(conn, NULL, VIR_ERR_INTERNAL_ERROR,
_("cannot wait for '%s': %s"),
largv[0], strerror(errno));
goto cleanup;
}
if (!(WIFEXITED(status) && WEXITSTATUS(status) == 0)) {
lxcError(conn, NULL, VIR_ERR_INTERNAL_ERROR,
_("container '%s' unexpectedly shutdown during startup"),
largv[0]);
goto cleanup;
}
#undef ADD_ARG
#undef ADD_ARG_LIT
#undef ADD_ARG_SPACE
ret = 0;
cleanup:
for (i = 0 ; i < largc ; i++)
VIR_FREE(largv[i]);
return ret;
no_memory:
lxcError(conn, NULL, VIR_ERR_NO_MEMORY, NULL);
goto cleanup;
}
/**
* lxcVmStart:
* @conn: pointer to connection
@ -660,7 +713,6 @@ static int lxcVmStart(virConnectPtr conn,
{
int rc = -1;
unsigned int i;
int monitor;
int parentTty;
char *parentTtyPath = NULL;
char *logfile = NULL;
@ -681,9 +733,6 @@ static int lxcVmStart(virConnectPtr conn,
return -1;
}
if ((monitor = lxcMonitorServer(conn, driver, vm)) < 0)
goto cleanup;
/* open parent tty */
if (virFileOpenTty(&parentTty, &parentTtyPath, 1) < 0) {
lxcError(conn, NULL, VIR_ERR_INTERNAL_ERROR,
@ -702,6 +751,12 @@ static int lxcVmStart(virConnectPtr conn,
if (lxcSetupInterfaces(conn, vm->def, &nveths, &veths) != 0)
goto cleanup;
/* Persist the live configuration now we have veth & tty info */
if (virDomainSaveConfig(conn, driver->stateDir, vm->def) < 0) {
rc = -1;
goto cleanup;
}
if ((logfd = open(logfile, O_WRONLY | O_TRUNC | O_CREAT,
S_IRUSR|S_IWUSR)) < 0) {
lxcError(conn, NULL, VIR_ERR_INTERNAL_ERROR,
@ -710,14 +765,11 @@ static int lxcVmStart(virConnectPtr conn,
goto cleanup;
}
if (lxcControllerStart(driver->stateDir,
vm->def, nveths, veths,
monitor, parentTty, logfd) < 0)
if (lxcControllerStart(conn,
vm,
nveths, veths,
parentTty, logfd) < 0)
goto cleanup;
/* Close the server side of the monitor, now owned
* by the controller process */
close(monitor);
monitor = -1;
/* Connect to the controller as a client *first* because
* this will block until the child has written their
@ -753,8 +805,6 @@ cleanup:
vethDelete(veths[i]);
VIR_FREE(veths[i]);
}
if (monitor != -1)
close(monitor);
if (rc != 0 && vm->monitor != -1) {
close(vm->monitor);
vm->monitor = -1;
@ -951,6 +1001,8 @@ static int lxcStartup(void)
vm = lxc_driver->domains;
while (vm) {
char *config = NULL;
virDomainDefPtr tmp;
int rc;
if ((vm->monitor = lxcMonitorClient(NULL, lxc_driver, vm)) < 0) {
vm = vm->next;
@ -965,6 +1017,19 @@ static int lxcStartup(void)
continue;
}
if ((config = virDomainConfigFile(NULL,
lxc_driver->stateDir,
vm->def->name)) == NULL)
continue;
/* Try and load the live config */
tmp = virDomainDefParseFile(NULL, lxc_driver->caps, config);
VIR_FREE(config);
if (tmp) {
vm->newDef = vm->def;
vm->def = tmp;
}
if (vm->pid != 0) {
vm->def->id = vm->pid;
vm->state = VIR_DOMAIN_RUNNING;