Linux 运算符的功能如何与“ansible”匹配；设置“U事实”；及；什么时候；

如何使用带有“何时”的set_事实模块来使用以下条件？我需要根据RHEL服务器中的总内存设置“shmall”值。 我需要知道操作员在Ansible中是如何工作的

- name: Total Available Memory
shell: cat /proc/meminfo | grep MemTotal | awk '{print $2}'
register: MemTotal

    # for RHEL7,SHMALL Setting should be (PHYSICAL MEMORY – MEMORY FOR SYSTEM) / PAGE SIZE with 4096 pagesize.
- name: SHMALL value to set for memory size less than 16G
set_fact:
    shmall: 3670016
    when: (MemTotal le "16777216") | int
- name: SHMALL value to set for memory size between 16G and 32G
set_fact:
    shmall: 7340032
    when: (MemTotal gt "16777216" and  MemTotal le "33554432") | int
- name: SHMALL value to set for memory size between 32G and 64G
set_fact:
    shmall: 14680064
    when: (MemTotal gt "33554432" and  MemTotal  le "6710886") | int
- name: SHMALL value to set for memory size between 64G and 256G
set_fact:
    shmall: 57671680
    when: (MemTotal  gt "67108864" and  MemTotal  le "268435456") | int

---

首先，您不需要从shell获取MemTotal，您可以从获取此信息。在这种情况下，该事实称为

ansible\u memtotal\u mb

。ansible中的运算符与python运算符非常相似，下面是我的笔记本的示例playbook，总内存为3834

playbook.yml 编辑：如问题所述，添加了任务。您不需要将memtotal转换为KB，将约束转换为MBs更容易

- name: SHMALL value to set for memory size less than 16G
  set_fact:
      shmall: 3670016
      when: ansible_memtotal_mb < 16384

- name: SHMALL value to set for memory size between 16G and 32G
  set_fact:
      shmall: 7340032
      when: ansible_memtotal_mb > 16384 and ansible_memtotal_mb < 32768

- name: SHMALL value to set for memory size between 32G and 64G
  set_fact:
      shmall: 14680064
      when: ansible_memtotal_mb > 32768 and ansible_memtotal_mb < 65536

- name: SHMALL value to set for memory size between 64G and 256G
  set_fact:
      shmall: 57671680
      when: ansible_memtotal_mb > 65536 and ansible_memtotal_mb < 262144

---

-名称：为小于16G的内存大小设置的最小值
设定事实：
上海购物中心：3670016
时间：ansible_memtotal_mb<16384
-名称：为16G和32G之间的内存大小设置的最小值
设定事实：
上海购物中心：7340032
当：ansible_memtotal_mb>16384且ansible_memtotal_mb<32768时
-名称：为32G和64G之间的内存大小设置的最小值
设定事实：
上海商城：1468064
当：ansible_memtotal_mb>32768且ansible_memtotal_mb<65536时
-名称：为64G和256G之间的内存大小设置的最小值
设定事实：
上海购物中心：57671680
当：ansible_memtotal_mb>65536且ansible_memtotal_mb<262144时

您可以计算小数值：

---
- hosts: localhost
  vars:
    mem_gb: "{{ ansible_memtotal_mb/1024 }}"
    mem_pow2: "{{ 2 | pow(((mem_gb|int|log)/(2|log)) | round(0,'ceil')) }}"
    shmall_calculated: "{{ ((mem_pow2|int)*0.875*1024*1024*1024/4096) | int }}"
  tasks:
    - debug:
        msg: "{{ shmall_calculated }}"

---

我的剧本的这一部分的目的是在sysctl.conf文件中针对服务器上的物理内存设置SHMALL值。为此，我需要以kb为单位的内存。-name:Generate the memory value in kb shell:cat/proc/meminfo | grep MemTotal | awk'{print$2}'register:MemTotal-debug:msg=“{MemTotal}”-name:SHMALL value为小于16G的内存大小设置set\u事实：#SHMALL:{（（（1000000*ansible_MemTotal_mb 4096）/4096）*0.4）{int}”shmall:3670016当：MemTotal<16777216时-name:shmall为16G和32G之间的内存大小设置的值set\u事实：shmall:7340032当：MemTotal>16777216且MemTotal<33554432My时本部分剧本的要求是；-检查Redhat服务器的总内存并以kb为单位计算-当：MemTotal<16777216时，系统配置文件中的shmall应更新为3670016-当：MemTotal>16777216且MemTotal<33554432时，系统配置文件中的shmall:1468064应更新-当：MemTotal>33554432且MemTotal<67108864时，应在sysconfig文件中更新shmall:1468064-name:shmall值以设置小于16G的内存大小set\u事实：shmall:3670016当：ansible\u memtotal\u mb<16384谢谢@Konstantin，我已经定义了shmall值。这是我需要的条件语句名称：为16G和32G之间的内存大小设置的最小值set_事实：SHMALL:7340032当：ansible_memtotal_mb>16384和ansible_memtotal_mb<32768-名称：为32G和64G之间的内存大小设置的最小值set_事实：SHMALL:14680064当：ansible_memtotal_mb>32768和ansible_memtotal_mb<65536-名称：oracle推荐的sysctl sysctl:name:{item.name}值：{{item.value}}sysctl_文件：/etc/sysctl.d/99-sysctl.conf ignoreerrors:yes#忽略关于带有_项的未知键的错误：-{name:“kernel.shmall”，值：{shmall}

- name: SHMALL value to set for memory size less than 16G
  set_fact:
      shmall: 3670016
      when: ansible_memtotal_mb < 16384

- name: SHMALL value to set for memory size between 16G and 32G
  set_fact:
      shmall: 7340032
      when: ansible_memtotal_mb > 16384 and ansible_memtotal_mb < 32768

- name: SHMALL value to set for memory size between 32G and 64G
  set_fact:
      shmall: 14680064
      when: ansible_memtotal_mb > 32768 and ansible_memtotal_mb < 65536

- name: SHMALL value to set for memory size between 64G and 256G
  set_fact:
      shmall: 57671680
      when: ansible_memtotal_mb > 65536 and ansible_memtotal_mb < 262144

---
- hosts: localhost
  vars:
    mem_gb: "{{ ansible_memtotal_mb/1024 }}"
    mem_pow2: "{{ 2 | pow(((mem_gb|int|log)/(2|log)) | round(0,'ceil')) }}"
    shmall_calculated: "{{ ((mem_pow2|int)*0.875*1024*1024*1024/4096) | int }}"
  tasks:
    - debug:
        msg: "{{ shmall_calculated }}"