[ansible-project] How to gather kernel parameters of remote hosts

[Vikrant Agarwal]

How to i collect remote hosts kernel parameters using ansible.  I'm looking to below type collect info of remote hosts . setup module doesn't collect this info .  

And sysctl module is to edit , can i use  sysctl module just to list the parameters and not to modify anything ? 

net.ipv4.ip_forward = 0
net.ipv4.conf.default.rp_filter = 1
net.ipv4.conf.default.accept_source_route = 0
kernel.sysrq = 0
kernel.core_uses_pid = 1
net.ipv4.tcp_syncookies = 1
kernel.msgmnb = 65536
kernel.msgmax = 65536
kernel.shmmax = 68719476736
kernel.shmall = 4294967296
fs.file-max = 209702
net.core.optmem_max = 10000000
net.core.rmem_default = 10000000
net.core.rmem_max = 10000000
net.core.wmem_default = 10000000
net.core.wmem_max = 10000000
net.ipv4.conf.all.rp_filter = 1
net.ipv4.tcp_max_tw_buckets = 2000000
net.ipv4.tcp_mem = 30000000 30000000 30000000
net.ipv4.tcp_rmem = 30000000 30000000 30000000
net.ipv4.tcp_wmem = 30000000 30000000 30000000
net.ipv4.ip_local_port_range = 32768 65000
net.ipv4.ip_forward = 0
net.ipv4.conf.default.rp_filter = 1
net.ipv4.tcp_timestamps = 1
net.ipv4.tcp_fin_timeout = 30
net.ipv4.tcp_keepalive_time = 300
net.ipv4.tcp_window_scaling = 1
net.ipv4.tcp_sack = 1
net.ipv4.igmp_max_memberships = 4096
kernel.pid_max = 131072
kernel.pid_max = 131072  

Regards

Vikrant

[Dick Visser]

Probably best done in one long cmd, for example:

- hosts: all
  vars:
    params:
      - net.ipv4.ip_forward
      - net.ipv4.conf.default.rp_filter
      - net.ipv4.conf.default.accept_source_route
      - kernel.sysrq
      - kernel.core_uses_pid
      - net.ipv4.tcp_syncookies
      - kernel.msgmnb
      - kernel.msgmax
      - kernel.shmmax
      - kernel.shmall
      - fs.file-max
      - net.core.optmem_max
      - net.core.rmem_default
      - net.core.rmem_max
      - net.core.wmem_default
      - net.core.wmem_max
      - net.ipv4.conf.all.rp_filter
      - net.ipv4.tcp_max_tw_buckets
      - net.ipv4.tcp_mem
      - net.ipv4.tcp_rmem
      - net.ipv4.tcp_wmem
      - net.ipv4.ip_local_port_range
      - net.ipv4.ip_forward
      - net.ipv4.conf.default.rp_filter
      - net.ipv4.tcp_timestamps
      - net.ipv4.tcp_fin_timeout
      - net.ipv4.tcp_keepalive_time
      - net.ipv4.tcp_window_scaling
      - net.ipv4.tcp_sack
      - net.ipv4.igmp_max_memberships
      - kernel.pid_max
      - kernel.pid_max

  tasks:
    - name: find out sysctl values
      shell: sysctl {{ params | join(' ') }}
      register: sysctl_out

    - debug: var=sysctl_out

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Dick Visser
Trust & Identity Service Operations Manager
GÉANT

[Stefan Hornburg (Racke)]

On 2/17/20 1:46 PM, Vikrant Agarwal wrote:
> How to i collect remote hosts kernel parameters using ansible.  I'm looking to below type collect info of remote hosts .
> setup module doesn't collect this info .  
>
> And sysctl module is to edit , can i use  sysctl module just to list the parameters and not to modify anything ?

According to its documentation, no.

But you can read the current values with

command: sysctl -a
register: sysctl_settings

Regards
Racke

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Ecommerce and Linux consulting + Perl and web application programming.
Debian and Sympa administration. Provisioning with Ansible.

[Vladimir Botka]

On Mon, 17 Feb 2020 14:47:19 +0100
Dick Visser <dick....@geant.org> wrote:

> tasks:
> - name: find out sysctl values
> shell: sysctl {{ params | join(' ') }}
> register: sysctl_out

Optionally ask sysctl to print values only and set dictionary of the
parameters and values. For example

- command: "sysctl -n {{ params | join(' ') }}"
register: sysctl_out
- set_fact:
sysctl_dict: "{{ dict(params|zip(sysctl_out.stdout_lines)) }}"

HTH,

-vlado