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One can specify in which cgroup hierarchies a systemd-nspawn container will appear

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This commit is contained in:
Léo Gillot-Lamure 2012-04-11 12:27:19 +01:00 committed by Lennart Poettering
parent 5430f7f2bc
commit 40c32a4ad4
3 changed files with 41 additions and 6 deletions
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2
TODO
View File

@ -17,6 +17,8 @@ Bugfixes:
Features:
* cg_create_and_attach() should fail for non-available controllers
* place start-pre/start-post/... scripts in sub cgrouprs
* Make RuntimeWatchdogUSec= property writable

10
man/systemd-nspawn.xml
View File

@ -154,6 +154,16 @@
</para></listitem>
</varlistentry>
<varlistentry>
<term><option>--controllers=</option></term>
<term><option>-C</option></term>
<listitem><para>Makes the container appear in
other hierarchies that the name=systemd:/ one.
Takes a comma-separated list of controllers.
</para></listitem>
</varlistentry>
<varlistentry>
<term><option>--private-network</option></term>

35
src/nspawn.c
View File

@ -52,16 +52,18 @@
static char *arg_directory = NULL;
static char *arg_user = NULL;
static char **arg_controllers = NULL;
static bool arg_private_network = false;
static int help(void) {
printf("%s [OPTIONS...] [PATH] [ARGUMENTS...]\n\n"
"Spawn a minimal namespace container for debugging, testing and building.\n\n"
" -h --help Show this help\n"
" -D --directory=NAME Root directory for the container\n"
" -u --user=USER Run the command under specified user or uid\n"
" --private-network Disable network in container\n",
" -h --help Show this help\n"
" -D --directory=NAME Root directory for the container\n"
" -u --user=USER Run the command under specified user or uid\n"
" -C --controllers=LIST Put the container in specified comma-separated cgroup hierarchies\n"
" --private-network Disable network in container\n",
program_invocation_short_name);
return 0;
@ -77,6 +79,7 @@ static int parse_argv(int argc, char *argv[]) {
{ "help", no_argument, NULL, 'h' },
{ "directory", required_argument, NULL, 'D' },
{ "user", required_argument, NULL, 'u' },
{ "controllers", required_argument, NULL, 'C' },
{ "private-network", no_argument, NULL, ARG_PRIVATE_NETWORK },
{ NULL, 0, NULL, 0 }
};
@ -86,7 +89,7 @@ static int parse_argv(int argc, char *argv[]) {
assert(argc >= 0);
assert(argv);
while ((c = getopt_long(argc, argv, "+hD:u:", options, NULL)) >= 0) {
while ((c = getopt_long(argc, argv, "+hD:u:C:", options, NULL)) >= 0) {
switch (c) {
@ -112,6 +115,17 @@ static int parse_argv(int argc, char *argv[]) {
break;
case 'C':
strv_free(arg_controllers);
arg_controllers = strv_split(optarg, ",");
if (!arg_controllers) {
log_error("Failed to split controllers list.");
return -ENOMEM;
}
strv_uniq(arg_controllers);
break;
case ARG_PRIVATE_NETWORK:
arg_private_network = true;
break;
@ -612,6 +626,7 @@ int main(int argc, char *argv[]) {
pid_t pid = 0;
int r = EXIT_FAILURE, k;
char *oldcg = NULL, *newcg = NULL;
char **controller = NULL;
int master = -1;
const char *console = NULL;
struct termios saved_attr, raw_attr;
@ -671,11 +686,18 @@ int main(int argc, char *argv[]) {
goto finish;
}
if ((k = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, newcg, 0)) < 0) {
k = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, newcg, 0);
if (k < 0) {
log_error("Failed to create cgroup: %s", strerror(-k));
goto finish;
}
STRV_FOREACH(controller,arg_controllers) {
k = cg_create_and_attach(*controller, newcg, 0);
if (k < 0)
log_warning("Failed to create cgroup in controller %s: %s", *controller, strerror(-k));
}
if ((master = posix_openpt(O_RDWR|O_NOCTTY|O_CLOEXEC|O_NDELAY)) < 0) {
log_error("Failed to acquire pseudo tty: %m");
goto finish;
@ -889,6 +911,7 @@ finish:
cg_kill_recursive_and_wait(SYSTEMD_CGROUP_CONTROLLER, newcg, true);
free(arg_directory);
strv_free(arg_controllers);
free(oldcg);
free(newcg);