fix:prepare阶段的一些小问题

roles/prepare/tasks/centos.yml

@@ -22,6 +22,7 @@
       - socat               # 用于port forwarding
     state: present
   when: 'INSTALL_SOURCE != "offline"'
+  ignore_errors: true
 
 # 离线安装基础软件包
 - import_tasks: offline.yml

roles/prepare/tasks/common.yml

@@ -14,15 +14,6 @@
   set_fact:
     KERNEL_VER: "{{ ansible_kernel.split('-')[0].split('.')[0]|int + ansible_kernel.split('-')[0].split('.')[1]|int/100 }}"
 
-#- name: 设置 nf_conntrack 模块名
-#  set_fact: NF_CONNTRACK="nf_conntrack"
-#  when: "KERNEL_VER|float >= 4.19"
-
-#- name: 设置 nf_conntrack_ipv4 模块名
-#  set_fact: NF_CONNTRACK="nf_conntrack_ipv4"
-#  when: "KERNEL_VER|float < 4.19"
-
-# 若提示nf_conntrack_ipv4模块不存在，错误可以忽略
 - name: 加载内核模块
   modprobe: name={{ item }} state=present
   with_items:
@@ -32,9 +23,12 @@
     - ip_vs_wrr
     - ip_vs_sh
     - nf_conntrack
-    - nf_conntrack_ipv4
   ignore_errors: true
 
+- name: 尝试加载nf_conntrack_ipv4
+  shell: 'modprobe nf_conntrack_ipv4 || echo "NoFound"'
+  register: NF_CONNTRACK_IPV4
+
 - name: 启用systemd自动加载模块服务
   service: name=systemd-modules-load enabled=yes
 

roles/prepare/tasks/main.yml

@@ -1,10 +1,10 @@
 # 系统基础软件环境
-#- name: apt更新缓存刷新
-#  apt: update_cache=yes cache_valid_time=72000
-#  ignore_errors: true
-#  when:
-#  - 'ansible_distribution in ["Ubuntu","Debian"]'
-#  - 'INSTALL_SOURCE != "offline"'
+- name: apt更新缓存刷新
+  apt: update_cache=yes cache_valid_time=72000
+  ignore_errors: true
+  when:
+  - 'ansible_distribution in ["Ubuntu","Debian"]'
+  - 'INSTALL_SOURCE != "offline"'
 
 - import_tasks: ubuntu.yml
   when: 'ansible_distribution in ["Ubuntu","Debian"]'
@@ -23,6 +23,14 @@
   - /root/.kube
   - /opt/kube/images
 
+# 某些系统没有/usr/bin/python，需要配置一个软链接，否则connection: local的任务会失败
+# 如果仍旧出现任务失败，重新执行一遍即可 https://github.com/ansible/ansible/issues/64903
+- name: symlink /usr/bin/python -> /usr/bin/python3
+  raw: |
+    if [ -f /usr/bin/python3 ] && [ ! -f /usr/bin/python ]; then
+      ln --symbolic /usr/bin/python3 /usr/bin/python;
+    fi
+
 - name: 写入环境变量$PATH 
   lineinfile:
     dest: ~/.bashrc

roles/prepare/tasks/ubuntu.yml

@@ -26,6 +26,7 @@
       - socat               # 用于port forwarding
     state: present
   when: 'INSTALL_SOURCE != "offline"'
+  ignore_errors: true
 
 # 离线安装基础软件包
 - import_tasks: offline.yml

roles/prepare/templates/10-k8s-modules.conf.j2

@@ -4,4 +4,6 @@ ip_vs_rr
 ip_vs_wrr
 ip_vs_sh
 nf_conntrack
+{% if 'NoFound' not in NF_CONNTRACK_IPV4.stdout %}
 nf_conntrack_ipv4
+{% endif %}