我正在研究自己的项目。必须执行以下步骤：
到目前为止，我已经完成了第2步。现在我想知道如何从远程服务器中提取pid，进程名称，cpu使用情况，交换内存使用情况并将其存储在某个可迭代变量中。这样我可以比较它来检查内存峰值？除了我的想法之外的任何其他方式都会很明显。我的代码示例是这样的：
import paramiko
import re
import psutil
class ShellHandler:
def __init__(self, host, user, psw):
self.ssh = paramiko.SSHClient()
self.ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
self.ssh.connect(host, username=user, password=psw, port=22)
channel = self.ssh.invoke_shell()
self.stdin = channel.makefile('wb')
self.stdout = channel.makefile('r')
def __del__(self):
self.ssh.close()
@staticmethod
def _print_exec_out(cmd, out_buf, err_buf, exit_status):
print('command executed: {}'.format(cmd))
print('STDOUT:')
for line in out_buf:
print(line, end="")
print('end of STDOUT')
print('STDERR:')
for line in err_buf:
print(line, end="")
print('end of STDERR')
print('finished with exit status: {}'.format(exit_status))
print('------------------------------------')
#print(psutil.pids())
pass
def execute(self, cmd):
"""
:param cmd: the command to be executed on the remote computer
:examples: execute('ls')
execute('finger')
execute('cd folder_name')
"""
cmd = cmd.strip('\n')
self.stdin.write(cmd + '\n')
finish = 'end of stdOUT buffer. finished with exit status'
echo_cmd = 'echo {} $?'.format(finish)
self.stdin.write(echo_cmd + '\n')
shin = self.stdin
self.stdin.flush()
shout = []
sherr = []
exit_status = 0
for line in self.stdout:
if str(line).startswith(cmd) or str(line).startswith(echo_cmd):
# up for now filled with shell junk from stdin
shout = []
elif str(line).startswith(finish):
# our finish command ends with the exit status
exit_status = int(str(line).rsplit(maxsplit=1)[1])
if exit_status:
# stderr is combined with stdout.
# thus, swap sherr with shout in a case of failure.
sherr = shout
shout = []
break
else:
# get rid of 'coloring and formatting' special characters
shout.append(re.compile(r'(\x9B|\x1B\[)[0-?]*[ -/]*[@-~]').sub('', line).replace('\b', '').replace('\r', ''))
# first and last lines of shout/sherr contain a prompt
if shout and echo_cmd in shout[-1]:
shout.pop()
if shout and cmd in shout[0]:
shout.pop(0)
if sherr and echo_cmd in sherr[-1]:
sherr.pop()
if sherr and cmd in sherr[0]:
sherr.pop(0)
self._print_exec_out(cmd=cmd, out_buf=shout, err_buf=sherr, exit_status=exit_status)
return shin, shout, sherr
obj=ShellHandler('Servername','username','password')
pID=[]
## I want this(pid, cmd, swap memory) to store in a varible which would be iterable.
pID=ShellHandler.execute(obj,"ps -eo pid,cmd,lstart,%mem,%cpu|awk '{print $1}'")
print(pID[0])##---------------------------------Problem not giving any output.
你的ShellHandler的execute方法返回三个项目，第一个是你发送给它的输入。
无论如何你应该像这样直接调用它：
obj = ShellHandler('Servername','username','password')
in, out, err = obj.execute("ps -eo pid,lstart,%mem,%cpu,cmd")
for line in out.split('\n'):
pid, lstartwd, lstartmo, lstartdd, lstartm, lstartyy, mem, cpu, cmd = line.split(None, 8)
我最后移动cmd因为它可能包含空格。 lstart值还包含多个以空格分隔的字段。这是Debian中输出的样子：
19626 Tue Jan 15 15:03:57 2019 0.0 0.0 less filename
关于如何更详细地解析ps输出有很多问题;我会把你推荐给他们，以便弄清楚如何正确处理split的结果。
ps aux命令应该包含您需要的所有信息（pid，进程名称，cpu，内存）