linux-namespaces

docker networking namespace not visible in ip netns list

由 感情迁移 提交于 2019-11-29 19:12:57
When I create a new docker container like with docker run -it -m 560m --cpuset-cpus=1,2 ubuntu sleep 120 and check its namespaces, I can see that new namespaces have been created (example for pid 7047). root@dude2:~# ls /proc/7047/ns -la total 0 dr-x--x--x 2 root root 0 Jul 7 12:17 . dr-xr-xr-x 9 root root 0 Jul 7 12:16 .. lrwxrwxrwx 1 root root 0 Jul 7 12:17 ipc -> ipc:[4026532465] lrwxrwxrwx 1 root root 0 Jul 7 12:17 mnt -> mnt:[4026532463] lrwxrwxrwx 1 root root 0 Jul 7 12:17 net -> net:[4026532299] lrwxrwxrwx 1 root root 0 Jul 7 12:17 pid -> pid:[4026532466] lrwxrwxrwx 1 root root 0 Jul 7

unshare --pid /bin/bash - fork cannot allocate memory

由 旧巷老猫 提交于 2019-11-28 20:49:20
I'm experimenting with linux namespaces. Specifically the pid namespace. I thought I'd test something out with bash but run into this problem: unshare -p /bin/bash bash: fork: Cannot allocate memory Running ls from there gave a core dump. Exit is the only thing possible. Why is it doing that? The error is caused by the PID 1 process exits in the new namespace. After bash start to run, bash will fork several new sub-processes to do somethings. If you run unshare without -f, bash will have the same pid as the current "unshare" process. The current "unshare" process call the unshare systemcall,

How to create multiple network namespace from a single process instance

由 不想你离开。 提交于 2019-11-28 17:10:05
问题 I am using following C function to create multiple network namespaces from a single process instance : void create_namespace(const char *ns_name) { char ns_path[100]; snprintf(ns_path, 100, "%s/%s", "/var/run/netns", ns_name); close(open(ns_path, O_RDONLY|O_CREAT|O_EXCL, 0)); unshare(CLONE_NEWNET); mount("/proc/self/ns/net", ns_path, "none", MS_BIND , NULL); } After my process creates all the namspaces and I add a tap interface to any of the one network namespace (with ip link set tap1 netns

docker networking namespace not visible in ip netns list

由 老子叫甜甜 提交于 2019-11-28 15:31:32
问题 When I create a new docker container like with docker run -it -m 560m --cpuset-cpus=1,2 ubuntu sleep 120 and check its namespaces, I can see that new namespaces have been created (example for pid 7047). root@dude2:~# ls /proc/7047/ns -la total 0 dr-x--x--x 2 root root 0 Jul 7 12:17 . dr-xr-xr-x 9 root root 0 Jul 7 12:16 .. lrwxrwxrwx 1 root root 0 Jul 7 12:17 ipc -> ipc:[4026532465] lrwxrwxrwx 1 root root 0 Jul 7 12:17 mnt -> mnt:[4026532463] lrwxrwxrwx 1 root root 0 Jul 7 12:17 net -> net:

unshare --pid /bin/bash - fork cannot allocate memory

由 て烟熏妆下的殇ゞ 提交于 2019-11-27 13:10:17
问题 I'm experimenting with linux namespaces. Specifically the pid namespace. I thought I'd test something out with bash but run into this problem: unshare -p /bin/bash bash: fork: Cannot allocate memory Running ls from there gave a core dump. Exit is the only thing possible. Why is it doing that? 回答1: The error is caused by the PID 1 process exits in the new namespace. After bash start to run, bash will fork several new sub-processes to do somethings. If you run unshare without -f, bash will have
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