我正在尝试更新主机变量中的字典，并且密钥的名称是使用变量（节点）构造的。例如，如果 'node' 为 1，那么我想更新 hostvars['fakehost']['mydict']['localaddress1']。这是我的代码：
- name: Read IPv4 of first interface
add_host:
name: "fakehost"
telium: "{{ hostvars['fakehost']['mydict'] | combine ({ 'localaddress{{ node }}' : ansible_all_ipv4_addresses[0] }) }}"
我不知道如何用 ansible 抱怨语法来构造 localaddress{{node}} 。
我有一个简单的任务，我无法克服。
我有一个返回 AWS EC2 实例配置的剧本。我只需要打印（显示）private_ip_address。
这是我的剧本
---
- hosts: local
connection: local
gather_facts: false
become: yes
become_method: enable
tasks:
- name: gather-info-ec2
community.aws.ec2_instance_info:
instance_ids:
- i-XXXXXAAAAAA
register: ec2
- debug: msg="{{ ec2.instances.network_interfaces.private_ip_address }}"
当我像这样运行它时，我收到以下错误。
fatal: [localhost]: FAILED! => {"msg": "The task includes an option with an undefined variable. The error was: 'list object' has no attribute 'network_interfaces'\n\nThe error appears to be in '/etc/ansible/playbooks/AWSLinuxMigration/gather_ec2_info.yaml': line 16, column 5, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n\n - debug: msg=\"{{ ec2.instances.network_interfaces.private_ip_address }}\"\n ^ here\nWe could be wrong, but this one looks like it might be an issue with\nmissing quotes. Always quote template expression brackets when they\nstart a value. For instance:\n\n with_items:\n - {{ foo }}\n\nShould be written as:\n\n with_items:\n - \"{{ foo }}\"\n"}
当我在没有 DEBUG 部分并使用-vvv的情况下执行它时，它会显示以下结果。如何提取并打印此地址？我把它缩短了一点，但你明白了
ok: [localhost] => {
"msg": {
"changed": false,
"failed": false,
"instances": [
{
"ami_launch_index": 0,
"architecture": "x86_64",
"block_device_mappings": [
{
"device_name": "/dev/xvda",
"ebs": {
"attach_time": "2020-04-15T16:11:19+00:00",
"delete_on_termination": true,
"status": "attached",
"volume_id": "xxxxxx"
}
}
],
"capacity_reservation_specification": {
"capacity_reservation_preference": "open"
},
"client_token": "",
"cpu_options": {
"core_count": 1,
"threads_per_core": 2
},
"ebs_optimized": true,
"ena_support": true,
"enclave_options": {
"enabled": false
},
"hibernation_options": {
"configured": false
},
"hypervisor": "xen",
"iam_instance_profile": {
"arn": "xxxxxx",
"id": "xxxxxx"
},
"image_id": "xxxxx",
"instance_id": "xxxxx",
"instance_type": "t3.medium",
"key_name": "xxxxx",
"launch_time": "2021-04-21T00:01:25+00:00",
"metadata_options": {
"http_endpoint": "enabled",
"http_put_response_hop_limit": 1,
"http_tokens": "optional",
"state": "applied"
},
"monitoring": {
"state": "disabled"
},
"network_interfaces": [
{
"association": {
"ip_owner_id": "xxxx",
"public_dns_name": "xxxxx",
"public_ip": "xxxx"
},
"attachment": {
"attach_time": "2020-04-15T16:11:18+00:00",
"attachment_id": "xxxxx",
"delete_on_termination": true,
"device_index": 0,
"network_card_index": 0,
"status": "attached"
},
"description": "Primary network interface",
"groups": [
{
"group_id": "xxxxx",
"group_name": "xxxxx"
}
],
"interface_type": "interface",
"ipv6_addresses": [],
"mac_address": "xxxxx",
"network_interface_id": "xxxx",
"owner_id": "xxxxx",
"private_dns_name": "ip-10-0-1-161.ec2.internal",
"private_ip_address": "10.0.1.161",
"private_ip_addresses": [
{
"association": {
"ip_owner_id": "xxxxx",
"public_dns_name": "xxxx.compute-1.amazonaws.com",
"public_ip": "2.2.2.2"
},
"primary": true,
"private_dns_name": "ip-333333.ec2.internal",
"private_ip_address": "1.1.1.1."
}
],
"source_dest_check": true,
"status": "in-use"
}
]
]
}
}
在 Bash 脚本中，我想检查 var1 是否位于 var2 和 var3 之间。但我找不到该怎么做。
像这样的东西。
var1=15
var2=10
var3=20
if [ "$var1" is located beetween "$var2" and "$var3" ]
then
echo "ok"
else
echo "not ok"
fi
你能帮我吗 ？
谢谢你。
我确信这是一个相当菜鸟的问题，我用谷歌搜索过，找不到直接的答案，但我可能问错了……我正在尝试制作一个开箱即用的配置脚本，以及所有需要的问题回答存储在一个名为 pass.ini 的文件中。当我在填充我的文件时从getstr（使用curses）获取用户输入时，它们都有b'variable string'作为它们的值。当我尝试执行剥离命令时，我得到 b'riable strin'。当我做一个 str(variable) 时，它会遇到同样的问题。我看到 b'<variable_string>' 可以表示它是字节码而不是解码的标志。所以我尝试了一个解码命令，但失败了，因为'str object has no attribute'decode'我让它通过ConfigParser写出来，并作为file.write写到一个单独的文件中。现在一切都被注释掉了，
这是信息收集模块：
wrapper(CommitChanges)
curses.echo()
stdscr.addstr( 8, 19, config.CIP , curses.color_pair(3) )
config.CIP = stdscr.getstr( 8, 19, 15)
stdscr.addstr( 9, 19, config.CSM , curses.color_pair(3) )
config.CSM = stdscr.getstr( 9, 19, 15)
stdscr.addstr( 10, 19, config.CGW , curses.color_pair(3) )
config.CGW = stdscr.getstr(10, 19, 15)
stdscr.addstr( 11, 19, config.CD1 , curses.color_pair(3) )
config.CD1 = stdscr.getstr(11, 19, 15)
stdscr.addstr( 12, 19, config.CD2 , curses.color_pair(3) )
config.CD2 = stdscr.getstr(12, 19, 15)
stdscr.addstr( 13, 19, config.CNTP, curses.color_pair(3) )
config.CNTP = stdscr.getstr(13, 19, 15)
stdscr.addstr( 16, 19, config.CHN , curses.color_pair(3) )
config.CHN = stdscr.getstr(16, 19, 15)
stdscr.addstr( 14, 19, config.CID , curses.color_pair(3) )
config.CID = stdscr.getstr(14, 19, 15)
stdscr.addstr( 15, 19, config.CS , curses.color_pair(3) )
config.CS = stdscr.getstr(15, 19, 15)
这是文件输出模块
def CommitChanges():
MOP = "X"
Config['Array=all']['PTLIP'] = a
Config['Array=all']['PTLSM'] = config.CSM.decode('utf-8')
Config['Array=all']['PTLGW'] = config.CGW.decode('utf-8')
Config['Array=all']['PTLD1'] = config.CD1.decode('utf-8')
Config['Array=all']['PTLD2'] = config.CD2.decode('utf-8')
Config['Array=all']['PTLNTP'] = config.CNTP.decode('utf-8')
Config['Array=all']['PTLIF'] = config.CIFN.decode('utf-8')
Config['Array=all']['PTLHSTNM'] = config.CHN.decode('utf-8')
Config['Array=all']['PTLMOB'] = config.CMOB.decode('utf-8')
Config['Array=all']['customerid'] = config.CID.decode('utf-8')
Config['Array=all']['site'] = config.CS.decode('utf-8')
with open('/opt/passp/pass.ini', 'w') as passini:
Config.write(passini, space_around_delimiters=False)
tpass= open('./pass.b', 'w')
tpass.write("[Array=All]"+ "\n")
tpass.write("ptlip="+ a + "\n")
tpass.write("ptlsm="+ config.CSM.decode('utf-8') +"\n")
tpass.write("ptlgw="+ config.CGW.decode('utf-8') + "\n")
tpass.write("ptld1="+ config.CD1.decode('utf-8') + "\n")
tpass.write("ptld2="+ config.CD2.decode('utf-8') + "\n")
tpass.write("ptlntp="+ config.CNTPdecode('utf-8') + "\n")
tpass.write("ptlif="+ config.CIFNdecode('utf-8') + "\n")
tpass.write("ptldhstnm="+ config.CHNdecode('utf-8') + "\n")
tpass.write("ptlmob="+ config.CMOBdecode('utf-8') + "\n")
tpass.write("customerid="+ config.CIDdecode('utf-8') + "\n")
tpass.write("site="+ config.CSdecode('utf-8') + "\n")
#if Backupfiles():
textchanges()
return
这是 ConfigParser 创建的文件保存输出
[Array=all]
ptlip=b'123'
ptlsm=b'321'
ptlgw=b'111'
ptld1=b'222'
ptld2=b'333'
ptlntp=b'444'
ptlif=s19
ptlhstnm=b'555'
ptlmob=
customerid=b'666'
site=b'777'
当我进行直接写入时它完全匹配（它们来自两次不同的运行，但即使有空数据它也有包装器。
有趣的是，'ptlif' 是通过查找接口名称收集的，它不是由用户输入处理的，因此它必须是 config.XXXX 变量的存储方式。
[Array=All]
ptlip=b''
ptlsm=b''
ptlgw=b''
ptld1=b''
ptld2=b''
ptlntp=b''
ptlif=s19
ptldhstnm=b''
ptlmob=
customerid=b''
site=b''
nginx 常见问题解答有没有一种正确的方法来使用 nginx 变量来缩短配置部分，将它们用作宏来使部分配置作为模板工作？）说（粗体是我的）：
问：是否有适当的方法使用 nginx 变量来缩短配置部分，将它们用作宏以使部分配置作为模板工作？
A：变量不应该用作模板宏。变量在处理每个请求期间在运行时进行评估，因此与普通静态配置相比，它们的成本相当高。使用变量来存储静态字符串也是一个坏主意。相反，应该使用宏扩展和“包含”指令来更轻松地生成配置，并且可以使用外部工具来完成，例如 sed + make 或任何其他常见的模板机制。
add_header Content-Security-Policy例如，为了更好的可读性，我使用的是一个超长的：
set $CSP "default-src 'none'";
set $CSP "${CSP}; connect-src 'self'";
set $CSP "${CSP}; script-src 'self' https://*.domain.org 'unsafe-inline' 'unsafe-eval'";
set $CSP "${CSP}; style-src 'self' https://*.domain.org 'unsafe-inline'";
set $CSP "${CSP}; img-src 'self' data: https://*.domain.org";
set $CSP "${CSP}; font-src 'self' https://*.domain.org";
## CSP closing colon.
set $CSP "${CSP};";
add_header Content-Security-Policy "$CSP";
适当地使用变量会对 nginx 性能产生多大影响？是否有关于该主题的任何性能测试/研究？
我想用变量创建一个数组$user并将$host它们传递给ssh命令。
我努力了：
my_array=('something1' 'something2' 'user' 'host_ip')
sudo ssh ${my_array[2]}@${my_array[3]}
my_array=('something1' 'something2' 'user' 'host_ip')
sudo ssh host -l ${my_array[2]} ## here host is not a variable
my_array=('something1' 'something2' 'username' 'host_ip')
my_var="${my_array[2]}@${my_array[3]}"
sudo ssh $my_var
在所有情况下，我都会被询问本地用户密码（因为sudo）并且我的答案被接受。当我输入远程用户密码时，我得到以下输出，我可以尝试 agian：
Permission denied, please try again.
笔记：
sudo ssh user@host）时它正在工作。非常感谢！
编辑
出于某种原因，第二天所有上述和下面的解决方案都奏效了......有人可以解释一下吗？
确定 bash 中的变量是否为空（“”）的最佳方法是什么？
我听说建议我这样做if [ "x$variable" = "x" ]
这是正确的方法吗？（必须有更直接的东西）