On 03/28/2016 12:33 AM, Loic Dachary wrote:
[resuming the previous mail, sent too early by mistake :-]
On 28/03/2016 00:29, Loic Dachary wrote:
Hi Thierry,
When teuthology runs ansible on a newly created host as:
/home/ubuntu/teuthology/virtualenv/bin/python /home/ubuntu/teuthology/virtualenv/bin/ansible-playbook -v --extra-vars {"ansible_ssh_user": "ubuntu"} -i /etc/ansible/hosts --limit target010011010028.teuthology /home/ubuntu/src/ceph-cm-ansible_master/cephlab.yml
it stalls because there are too many hosts in the inventory (65537) and
newfstatat(AT_FDCWD, "/etc/ansible/hosts/host_vars/target010011203193.teuthology", 0x7fc8f1a4f0, AT_SYMLINK_NOFOLLOW) = -1 ENOENT (No such file or directory)
newfstatat(AT_FDCWD, "/etc/ansible/hosts/host_vars/target010011203193.teuthology.yml", 0x7fc8f1a4f0, AT_SYMLINK_NOFOLLOW) = -1 ENOENT (No such file or directory)
newfstatat(AT_FDCWD, "/etc/ansible/hosts/host_vars/target010011203193.teuthology.yaml", 0x7fc8f1a4f0, AT_SYMLINK_NOFOLLOW) = -1 ENOENT (No such file or directory)
newfstatat(AT_FDCWD, "/etc/ansible/hosts/host_vars/target010011203193.teuthology.json", 0x7fc8f1a4f0, AT_SYMLINK_NOFOLLOW) = -1 ENOENT (No such file or directory)
newfstatat(AT_FDCWD, "/etc/ansible/hosts/", {st_mode=S_IFDIR|0755, st_size=4096, ...}, 0) = 0
newfstatat(AT_FDCWD, "/etc/ansible/hosts", {st_mode=S_IFDIR|0755, st_size=4096, ...}, 0) = 0
newfstatat(AT_FDCWD, "/etc/ansible/hosts/host_vars/target010011203194.teuthology", 0x7fc8f1a4f0, AT_SYMLINK_NOFOLLOW) = -1 ENOENT (No such file or directory)
newfstatat(AT_FDCWD, "/etc/ansible/hosts/host_vars/target010011203194.teuthology.yml", 0x7fc8f1a4f0, AT_SYMLINK_NOFOLLOW) = -1 ENOENT (No such file or directory)
newfstatat(AT_FDCWD, "/etc/ansible/hosts/host_vars/target010011203194.teuthology.yaml", 0x7fc8f1a4f0, AT_SYMLINK_NOFOLLOW) = -1 ENOENT (No such file or directory)
newfstatat(AT_FDCWD, "/etc/ansible/hosts/host_vars/target010011203194.teuthology.json", 0x7fc8f1a4f0, AT_SYMLINK_NOFOLLOW) = -1 ENOENT (No such file or directory)
takes forever. This is running on an ARMv8 virtual machine:
(virtualenv)ubuntu@teuthology:~/teuthology$ cat /proc/cpuinfo
Processor : AArch64 Processor rev 1 (aarch64)
processor : 0
Features : fp asimd evtstrm
CPU implementer : 0x50
CPU architecture: AArch64
CPU variant : 0x0
CPU part : 0x000
CPU revision : 1
Hardware : linux,dummy-virt
which also explains why it's not very fast. Do you know of a way to ask ansible to only consider one host instead of what appears to be a systematic exploration of all possible hosts in the inventory, only to finally select the one from the --limit argument ?
Salut loic,
I didn't test, I don't examine how exactly ansible implement inventory
construction and I can't presently duplicate your testing environment.
This said, You could try to change ceph-cm-ansible/teuthology.yml to
allow host restriction via play hosts directive rather than limit parameter.
echo -e "/hosts: teuthology/s/teuthology/\"{{ targets |
default('teuthology') }}\"/\nwq" | ed ceph-cm-ansible/teuthology.yml
And then use a extra-vars param as usual.
The idea being that when using limit parameter you may need to access
other hosts facts to achieve your play on limited target (or for
delegated actions) and thus need to construct the full set of hosts facts.
If I guessed right, when limiting via hosts directive you explicitly
choose a hosts subset (usually a group) from inventory before running
the play rather than applying a filter at a later time.
If this works, some tasks may fail because you really need some other
hosts from the inventory (say to enable delegated actions), but you
could refine your targets variables by adding more hosts.
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