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在容器内部无法获取容器名称时，如何操作？
当创建容器时，我们可以通过记录容器名称与ID到redis中。
在容器内部，通过 cat /proc/self/cgroup 获取容器ID。 应用场景在容器内部，想要获取容器名称，替换容器内某些文件内的字符串， 代码如下： # -*-coding:utf-8-*-
import os
import redis
def alter(file, new_str, old_str="abc_123abc"):
"""
替换文件中的字符串
file:文件名
old_str:就字符串
new_str:新字符串
"""
file_data = ""
with open(file, "r") as f:
for line in f:
if old_str in line:
line = line.replace(old_str, new_str)
file_data += line
with open(file, "w") as f:
f.write(file_data)
def get_container_name():
db = redis.Redis(host="192.168.0.111", port=6380, decode_responses=False)
# start: in container, run next code -------------------------------------------------
cmd = "cat /proc/self/cgroup"
output = os.popen(cmd)
rests = output.readlines()
container_message= rests[-1]
if not container_message:
container_id = "abc"
else:
container_id = container_message.strip().split("docker-")[-1][:12]
# end. ----------------------------------------------------------------------------------
container_name = None
if container_id != "abc":
key_name = "nm_" + container_id
container_name = db.hget("container_msg", key_name)
if container_name:
container_name = container_name.decode("utf-8")
return container_name
def run():
nginx_conf = "/etc/nginx/nginx.conf"
galaxy_yml = "/galaxy-central/config/galaxy.yml"
container_name = get_container_name()
if container_name is not None:
alter(nginx_conf, container_name)
os.popen("nginx -s reload")
# os.popen("cp /galaxy-central/config/galaxy.yml.sample /galaxy-central/config/galaxy.yml")
alter(galaxy_yml, container_name)
print("Replacement string 'abc_123abc' succeeded")
else:
print("Replacement string 'abc_123abc' failed")
if __name__ == '__main__':
run()
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