普通用戶啟動supervisor報HTTP錯誤(strace)解決分析

更新時間：2023年07月05日 08:45:46 作者：仁揚

這篇文章主要為大家介紹了普通用戶啟動supervisor報HTTP錯誤strace的問題解決分析，有需要的朋友可以借鑒參考下，希望能夠有所幫助，祝大家多多進步，早日升職加薪

報錯信息

公司的開發(fā)對生產(chǎn)環(huán)境都有普通用戶 www 的權限，采用堡壘機登錄到生產(chǎn)環(huán)境的機器。

默認 supervisor 使用 root 用戶啟動，開發(fā)沒有權限直接修改配置和操作 supervisor 管理的進程，所以 supervisor 都采用 www 用戶啟動就解決問題了。

但是今天操作生產(chǎn)環(huán)境的時候，報的錯誤令人懵逼，SRE 同學折騰了好久，配置來配置去，搞不明白為啥 www 就是啟動不了 supervisor ！

報錯信息是這樣的：

[www@**************** ~]$ supervisord -c /etc/supervisord.conf
Error: Cannot open an HTTP server: socket.error reported errno.EACCES (13)
For help, use /usr/bin/supervisord -h

翻遍谷歌、百度，找到的資料，沒有一個真的能解決了問題，焦頭爛額。

突然想起 strace 這個命令，于是乎，我改成這樣子執(zhí)行：

[www@**************** ~]$ strace supervisord -c /etc/supervisord.conf

奇跡發(fā)生了！

read(6, "\0S(\1\0\0\0N(\3\0\0\0R'\0\0\0R \0\0\0R\24\0\0\0(\1\0\0"..., 4096) = 1381
read(6, "", 4096)                       = 0
close(6)                                = 0
close(5)                                = 0
close(4)                                = 0
getpid()                                = 3656
unlink("/var/run/supervisor/supervisor.sock.3656") = -1 ENOENT (No such file or directory)
socket(AF_UNIX, SOCK_STREAM, 0)         = 4
bind(4, {sa_family=AF_UNIX, sun_path="/var/run/supervisor/supervisor.sock.3656"}, 42) = -1 EACCES (Permission denied)
unlink("/var/run/supervisor/supervisor.sock.3656") = -1 ENOENT (No such file or directory)
write(2, "Error: Cannot open an HTTP serve"..., 75Error: Cannot open an HTTP server: socket.error reported errno.EACCES (13)
) = 75
write(2, "For help, use /usr/bin/superviso"..., 38For help, use /usr/bin/supervisord -h
) = 38
close(4)                                = 0
rt_sigaction(SIGINT, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=SA_RESTORER, sa_restorer=0x7fa06ce997e0}, {sa_handler=0x7fa06d1b0750, sa_mask=[], sa_flags=SA_RESTORER, sa_restorer=0x7fa06ce997e0}, 8) = 0
close(3)                                = 0
close(11)                               = 0
exit_group(2)                           = ?
+++ exited with 2 +++

原來是沒有權限，把 sock 文件挪到 www 用戶下，問題解決。

關于 strace 命令

如果你的服務器還沒安裝 strace，可以用下面命令安裝：

# Ubuntu / Debian
sudo apt install strace
# CentOS
yum install -y strace

如果一個進程已經(jīng)在運行，可以通過 PID 跟蹤程序的系統(tǒng)調用，使用 CTRL + C 中止跟蹤：

[root@**************** ~]# strace -p 16701
strace: Process 16701 attached
restart_syscall(<... resuming interrupted read ...>) = 0
sendto(8, "*2\r\n$4\r\nLLEN\r\n$52\r\nhorizon:comma"..., 73, MSG_DONTWAIT, NULL, 0) = 73
poll([{fd=8, events=POLLIN|POLLERR|POLLHUP}], 1, 60000) = 1 ([{fd=8, revents=POLLIN}])
recvfrom(8, ":0\r\n", 8192, MSG_DONTWAIT, NULL, NULL) = 4
sendto(9, "*2\r\n$4\r\nLLEN\r\n$14\r\nqueues:defaul"..., 35, MSG_DONTWAIT, NULL, 0) = 35
poll([{fd=9, events=POLLIN|POLLERR|POLLHUP}], 1, 60000) = 1 ([{fd=9, revents=POLLIN}])
recvfrom(9, ":0\r\n", 8192, MSG_DONTWAIT, NULL, NULL) = 4
sendto(8, "*3\r\n$4\r\nHGET\r\n$21\r\nhorizon:queue"..., 55, MSG_DONTWAIT, NULL, 0) = 55
poll([{fd=8, events=POLLIN|POLLERR|POLLHUP}], 1, 60000) = 1 ([{fd=8, revents=POLLIN}])
recvfrom(8, "$18\r\n1.6690604487864007\r\n", 8192, MSG_DONTWAIT, NULL, NULL) = 25
wait4(16711, 0x7ffeaafa566c, WNOHANG|WSTOPPED, NULL) = 0
select(15, [12 14], [], [], {tv_sec=0, tv_usec=0}) = 0 (Timeout)
wait4(16712, 0x7ffeaafa566c, WNOHANG|WSTOPPED, NULL) = 0
select(17, [13 16], [], [], {tv_sec=0, tv_usec=0}) = 0 (Timeout)
wait4(16713, 0x7ffeaafa566c, WNOHANG|WSTOPPED, NULL) = 0
select(19, [15 18], [], [], {tv_sec=0, tv_usec=0}) = 0 (Timeout)
sendto(8, "*14\r\n$5\r\nHMSET\r\n$54\r\nhorizon:sup"..., 500, MSG_DONTWAIT, NULL, 0) = 500
sendto(8, "*4\r\n$4\r\nZADD\r\n$19\r\nhorizon:super"..., 99, MSG_DONTWAIT, NULL, 0) = 99
sendto(8, "*3\r\n$6\r\nEXPIRE\r\n$54\r\nhorizon:sup"..., 85, MSG_DONTWAIT, NULL, 0) = 85
poll([{fd=8, events=POLLIN|POLLERR|POLLHUP}], 1, 60000) = 1 ([{fd=8, revents=POLLIN}])
recvfrom(8, "+OK\r\n:0\r\n:1\r\n", 8192, MSG_DONTWAIT, NULL, NULL) = 13
sendto(8, "*3\r\n$5\r\nSETNX\r\n$29\r\nhorizon:moni"..., 58, MSG_DONTWAIT, NULL, 0) = 58
poll([{fd=8, events=POLLIN|POLLERR|POLLHUP}], 1, 60000) = 1 ([{fd=8, revents=POLLIN}])
recvfrom(8, ":0\r\n", 8192, MSG_DONTWAIT, NULL, NULL) = 4
rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
rt_sigaction(SIGCHLD, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
nanosleep({tv_sec=1, tv_nsec=0}, 0x7ffeaafa54a0) = 0
sendto(8, "*2\r\n$4\r\nLLEN\r\n$52\r\nhorizon:comma"..., 73, MSG_DONTWAIT, NULL, 0) = 73
poll([{fd=8, events=POLLIN|POLLERR|POLLHUP}], 1, 60000) = 1 ([{fd=8, revents=POLLIN}])
recvfrom(8, ":0\r\n", 8192, MSG_DONTWAIT, NULL, NULL) = 4
wait4(16711, 0x7ffeaafa566c, WNOHANG|WSTOPPED, NULL) = 0
select(15, [12 14], [], [], {tv_sec=0, tv_usec=0}) = 0 (Timeout)
wait4(16712, 0x7ffeaafa566c, WNOHANG|WSTOPPED, NULL) = 0
select(17, [13 16], [], [], {tv_sec=0, tv_usec=0}) = 0 (Timeout)
wait4(16713, 0x7ffeaafa566c, WNOHANG|WSTOPPED, NULL) = 0
select(19, [15 18], [], [], {tv_sec=0, tv_usec=0}) = 0 (Timeout)
sendto(8, "*14\r\n$5\r\nHMSET\r\n$54\r\nhorizon:sup"..., 500, MSG_DONTWAIT, NULL, 0) = 500
sendto(8, "*4\r\n$4\r\nZADD\r\n$19\r\nhorizon:super"..., 99, MSG_DONTWAIT, NULL, 0) = 99
sendto(8, "*3\r\n$6\r\nEXPIRE\r\n$54\r\nhorizon:sup"..., 85, MSG_DONTWAIT, NULL, 0) = 85
poll([{fd=8, events=POLLIN|POLLERR|POLLHUP}], 1, 60000) = 1 ([{fd=8, revents=POLLIN}])
recvfrom(8, "+OK\r\n:0\r\n:1\r\n", 8192, MSG_DONTWAIT, NULL, NULL) = 13
sendto(8, "*3\r\n$5\r\nSETNX\r\n$29\r\nhorizon:moni"..., 58, MSG_DONTWAIT, NULL, 0) = 58
poll([{fd=8, events=POLLIN|POLLERR|POLLHUP}], 1, 60000) = 1 ([{fd=8, revents=POLLIN}])
recvfrom(8, ":0\r\n", 8192, MSG_DONTWAIT, NULL, NULL) = 4
rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
rt_sigaction(SIGCHLD, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
nanosleep({tv_sec=1, tv_nsec=0}, ^Cstrace: Process 16701 detached
 <detached ...>

使用 -c 參數(shù)，可以得到各個系統(tǒng)調用的耗時、調用次數(shù)、錯誤數(shù)：

[root@**************** ~]# strace -p 16701 -c
strace: Process 16701 attached
^Cstrace: Process 16701 detached
% time     seconds  usecs/call     calls    errors syscall
------ ----------- ----------- --------- --------- ----------------
 54.00    0.000216           5        39           sendto
 11.25    0.000045           1        25           recvfrom
  9.25    0.000037           1        25           poll
  8.25    0.000033           5         6           nanosleep
  6.50    0.000026           1        21           select
  5.75    0.000023           1        21           wait4
  3.50    0.000014           1        14           rt_sigprocmask
  1.50    0.000006           0         7           rt_sigaction
  0.00    0.000000           0         1           restart_syscall
------ ----------- ----------- --------- --------- ----------------
100.00    0.000400                   159           total

使用 -tt 參數(shù)，顯示時間戳（微妙），-T 參數(shù)顯示系統(tǒng)調用的耗時，合起來用效果是這樣的：

[root@**************** ~]# strace -p 16701 -tt -T
strace: Process 16701 attached
23:05:15.019519 restart_syscall(<... resuming interrupted read ...>) = 0 <0.915045>
23:05:15.934770 sendto(8, "*2\r\n$4\r\nLLEN\r\n$52\r\nhorizon:comma"..., 73, MSG_DONTWAIT, NULL, 0) = 73 <0.000080>
23:05:15.934975 poll([{fd=8, events=POLLIN|POLLERR|POLLHUP}], 1, 60000) = 1 ([{fd=8, revents=POLLIN}]) <0.000022>
23:05:15.935065 recvfrom(8, ":0\r\n", 8192, MSG_DONTWAIT, NULL, NULL) = 4 <0.000022>
23:05:15.935215 wait4(16711, 0x7ffeaafa566c, WNOHANG|WSTOPPED, NULL) = 0 <0.000023>
23:05:15.935301 select(15, [12 14], [], [], {tv_sec=0, tv_usec=0}) = 0 (Timeout) <0.000026>
23:05:15.935390 wait4(16712, 0x7ffeaafa566c, WNOHANG|WSTOPPED, NULL) = 0 <0.000018>
23:05:15.935446 select(17, [13 16], [], [], {tv_sec=0, tv_usec=0}) = 0 (Timeout) <0.000018>
23:05:15.935503 wait4(16713, 0x7ffeaafa566c, WNOHANG|WSTOPPED, NULL) = 0 <0.000023>
23:05:15.935574 select(19, [15 18], [], [], {tv_sec=0, tv_usec=0}) = 0 (Timeout) <0.000023>
23:05:15.935731 sendto(8, "*14\r\n$5\r\nHMSET\r\n$54\r\nhorizon:sup"..., 500, MSG_DONTWAIT, NULL, 0) = 500 <0.000059>
23:05:15.935848 sendto(8, "*4\r\n$4\r\nZADD\r\n$19\r\nhorizon:super"..., 99, MSG_DONTWAIT, NULL, 0) = 99 <0.000046>
23:05:15.935937 sendto(8, "*3\r\n$6\r\nEXPIRE\r\n$54\r\nhorizon:sup"..., 85, MSG_DONTWAIT, NULL, 0) = 85 <0.000041>
23:05:15.936028 poll([{fd=8, events=POLLIN|POLLERR|POLLHUP}], 1, 60000) = 1 ([{fd=8, revents=POLLIN}]) <0.000019>
23:05:15.936088 recvfrom(8, "+OK\r\n:0\r\n:1\r\n", 8192, MSG_DONTWAIT, NULL, NULL) = 13 <0.000018>
23:05:15.936278 sendto(8, "*3\r\n$5\r\nSETNX\r\n$29\r\nhorizon:moni"..., 58, MSG_DONTWAIT, NULL, 0) = 58 <0.000057>
23:05:15.936385 poll([{fd=8, events=POLLIN|POLLERR|POLLHUP}], 1, 60000) = 1 ([{fd=8, revents=POLLIN}]) <0.000019>
23:05:15.936441 recvfrom(8, ":0\r\n", 8192, MSG_DONTWAIT, NULL, NULL) = 4 <0.000017>
23:05:15.936505 rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0 <0.000017>
23:05:15.936564 rt_sigaction(SIGCHLD, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0 <0.000023>
23:05:15.936624 rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0 <0.000017>
23:05:15.936672 nanosleep({tv_sec=1, tv_nsec=0}, ^Cstrace: Process 16701 detached
 <detached ...>

常用的參數(shù)也就這么幾個，如果記不住，直接看幫助吧：）

以上就是普通用戶啟動 supervisor 報 HTTP 錯誤（strace）的詳細內容，更多關于啟動 supervisor 報 HTTP 錯誤的資料請關注腳本之家其它相關文章！

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