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Merge pull request #1072 from adrianreber/master

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c/r: drop in-flight connections during CRIU dump
This commit is contained in:
Christian Brauner 2016-07-13 23:16:49 +02:00 committed by GitHub
commit 41a8036745
2 changed files with 25 additions and 6 deletions
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25
src/lxc/criu.c
View File

@ -50,6 +50,8 @@
#define CRIU_GITID_VERSION "2.0"
#define CRIU_GITID_PATCHLEVEL 0
#define CRIU_IN_FLIGHT_SUPPORT "2.4"
lxc_log_define(lxc_criu, lxc);
struct criu_opts {
@ -75,6 +77,9 @@ struct criu_opts {
* different) on the target host. NULL if lxc.console = "none".
*/
char *console_name;
/* The detected version of criu */
char *criu_version;
};
static int load_tty_major_minor(char *directory, char *output, int len)
@ -264,6 +269,10 @@ static void exec_criu(struct criu_opts *opts)
if (ret < 0 || ret >= sizeof(log))
goto err;
if (!opts->user->disable_skip_in_flight &&
strcmp(opts->criu_version, CRIU_IN_FLIGHT_SUPPORT) >= 0)
DECLARE_ARG("--skip-in-flight");
DECLARE_ARG("--freeze-cgroup");
DECLARE_ARG(log);
@ -511,11 +520,11 @@ version_error:
/* Check and make sure the container has a configuration that we know CRIU can
* dump. */
static bool criu_ok(struct lxc_container *c)
static bool criu_ok(struct lxc_container *c, char **criu_version)
{
struct lxc_list *it;
if (!criu_version_ok(NULL))
if (!criu_version_ok(criu_version))
return false;
if (geteuid()) {
@ -573,7 +582,7 @@ out_unlock:
// do_restore never returns, the calling process is used as the
// monitor process. do_restore calls exit() if it fails.
void do_restore(struct lxc_container *c, int status_pipe, struct migrate_opts *opts)
void do_restore(struct lxc_container *c, int status_pipe, struct migrate_opts *opts, char *criu_version)
{
pid_t pid;
char pidfile[L_tmpnam];
@ -664,6 +673,7 @@ void do_restore(struct lxc_container *c, int status_pipe, struct migrate_opts *o
os.pidfile = pidfile;
os.cgroup_path = cgroup_canonical_path(handler);
os.console_fd = c->lxc_conf->console.slave;
os.criu_version = criu_version;
if (os.console_fd >= 0) {
/* Twiddle the FD_CLOEXEC bit. We want to pass this FD to criu
@ -848,8 +858,9 @@ static int save_tty_major_minor(char *directory, struct lxc_container *c, char *
static bool do_dump(struct lxc_container *c, char *mode, struct migrate_opts *opts)
{
pid_t pid;
char *criu_version = NULL;
if (!criu_ok(c))
if (!criu_ok(c, &criu_version))
return false;
if (mkdir_p(opts->directory, 0700) < 0)
@ -868,6 +879,7 @@ static bool do_dump(struct lxc_container *c, char *mode, struct migrate_opts *op
os.user = opts;
os.c = c;
os.console_name = c->lxc_conf->console.path;
os.criu_version = criu_version;
if (save_tty_major_minor(opts->directory, c, os.tty_id, sizeof(os.tty_id)) < 0)
exit(1);
@ -927,8 +939,9 @@ bool __criu_restore(struct lxc_container *c, struct migrate_opts *opts)
pid_t pid;
int status, nread;
int pipefd[2];
char *criu_version = NULL;
if (!criu_ok(c))
if (!criu_ok(c, &criu_version))
return false;
if (geteuid()) {
@ -951,7 +964,7 @@ bool __criu_restore(struct lxc_container *c, struct migrate_opts *opts)
if (pid == 0) {
close(pipefd[0]);
// this never returns
do_restore(c, pipefd[1], opts);
do_restore(c, pipefd[1], opts, criu_version);
}
close(pipefd[1]);

6
src/lxc/lxccontainer.h
View File

@ -896,6 +896,12 @@ struct migrate_opts {
* "action script"
*/
char *action_script;
/* If CRIU >= 2.4 is detected the option to skip in-flight connections
* will be enabled by default. The flag 'disable_skip_in_flight' will
* unconditionally disable this feature. In-flight connections are
* not fully established TCP connections: SYN, SYN-ACK */
bool disable_skip_in_flight;
};
/*!