how to execute multiline command in ansible 2.9.10 in fedora 32 - ansible

Question

I want to execute a command using ansible 2.9.10 in remote machine, first I tried like this:
ansible kubernetes-root -m command -a "cat > /etc/docker/daemon.json <<EOF
{
"exec-opts": ["native.cgroupdriver=systemd"],
"log-driver": "json-file",
"log-opts": {
"max-size": "100m"
},
"storage-driver": "overlay2",
"registry-mirrors":[
"https://kfwkfulq.mirror.aliyuncs.com",
"https://2lqq34jg.mirror.aliyuncs.com",
"https://pee6w651.mirror.aliyuncs.com",
"http://hub-mirror.c.163.com",
"https://docker.mirrors.ustc.edu.cn",
"https://registry.docker-cn.com"
]
}"
obviously it is not working.so I read this guide and tried like this:
- hosts: kubernetes-root
remote_user: root
tasks:
- name: add docker config
shell: >
cat > /etc/docker/daemon.json <<EOF
{
"exec-opts": ["native.cgroupdriver=systemd"],
"log-driver": "json-file",
"log-opts": {
"max-size": "100m"
},
"storage-driver": "overlay2",
"registry-mirrors":[
"https://kfwkfulq.mirror.aliyuncs.com",
"https://2lqq34jg.mirror.aliyuncs.com",
"https://pee6w651.mirror.aliyuncs.com",
"http://hub-mirror.c.163.com",
"https://docker.mirrors.ustc.edu.cn",
"https://registry.docker-cn.com"
]
}
and execute it like this:
[dolphin#MiWiFi-R4CM-srv playboook]$ ansible-playbook add-docker-config.yaml
[WARNING]: Invalid characters were found in group names but not replaced, use
-vvvv to see details
ERROR! We were unable to read either as JSON nor YAML, these are the errors we got from each:
JSON: Expecting value: line 1 column 1 (char 0)
Syntax Error while loading YAML.
could not find expected ':'
The error appears to be in '/home/dolphin/source-share/source/dolphin/dolphin-scripts/ansible/playboook/add-docker-config.yaml': line 7, column 7, but may
be elsewhere in the file depending on the exact syntax problem.
The offending line appears to be:
cat > /etc/docker/daemon.json <<EOF
{
^ here
is there anyway to achive this?how to fix it?

Answer 1

your playbook should work fine, you just have to add some indentation after the shell clause line, and change the > to |:
here is the updated PB:
---
- name: play name
hosts: dell420
gather_facts: false
vars:
tasks:
- name: run shell task
shell: |
cat > /tmp/temp.file << EOF
{
"exec-opts": ["native.cgroupdriver=systemd"],
"log-driver": "json-file",
"log-opts": {
"max-size": "100m"
},
"storage-driver": "overlay2",
"registry-mirrors":[
"https://kfwkfulq.mirror.aliyuncs.com",
"https://2lqq34jg.mirror.aliyuncs.com",
"https://pee6w651.mirror.aliyuncs.com",
"http://hub-mirror.c.163.com",
"https://docker.mirrors.ustc.edu.cn",
"https://registry.docker-cn.com"
]
}
EOF
Not sure what is wrong with the ad-hoc command, i tried a few things but didnt manage to make it work.
hope these help
EDIT:
as pointed out by Zeitounator, the ad-hoc command will work if you use shell module instead of command. example:
ansible -i hosts dell420 -m shell -a 'cat > /tmp/temp.file <<EOF
{
"exec-opts": ["native.cgroupdriver=systemd"],
"log-driver": "json-file",
"log-opts": {
"max-size": "100m"
},
"storage-driver": "overlay2",
"registry-mirrors":[
"https://kfwkfulq.mirror.aliyuncs.com",
"https://2lqq34jg.mirror.aliyuncs.com",
"https://pee6w651.mirror.aliyuncs.com",
"http://hub-mirror.c.163.com",
"https://docker.mirrors.ustc.edu.cn",
"https://registry.docker-cn.com"
]
}
EOF
'