所有流浪的PHP CLI脚本都在Mac OS X上等待主机解析

Question

I've been getting hangs when executing PHP commands on my Homestead vagrant box running Ubuntu. There is a significant lag before the console even starts the php cli execution.

Ran strace -vyT -S time php artisan help from vagrant box. Everything gets stuck for several minutes on the first to last call to recvfrom(3 , but I have no idea why:

open("/etc/resolv.conf", O_RDONLY|O_CLOEXEC) = 3 <0.000010>
fstat(3</run/resolvconf/resolv.conf>, {st_dev=makedev(0, 16), st_ino=7632, st_mode=S_IFREG|0644, st_nlink=1, st_uid=0, st_gid=0, st_blksize=4096, st_blocks=8, st_size=171, st_atime=2015/10/17-04:53:56, st_mtime=2015/10/17-04:53:54, st_ctime=2015/10/17-04:53:54}) = 0 <0.000007>
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fed9385c000 <0.000008>
read(3</run/resolvconf/resolv.conf>, "# Dynamic resolv.conf(5) file fo"..., 4096) = 171 <0.000010>
read(3</run/resolvconf/resolv.conf>, "", 4096) = 0 <0.000006>
close(3</run/resolvconf/resolv.conf>)   = 0 <0.000008>
munmap(0x7fed9385c000, 4096)            = 0 <0.000011>
uname({sysname="Linux", nodename="homestead", release="3.13.0-65-generic", version="#106-Ubuntu SMP Fri Oct 2 22:08:27 UTC 2015", machine="x86_64", domainname="(none)"}) = 0 <0.000006>
stat("/etc/resolv.conf", {st_dev=makedev(0, 16), st_ino=7632, st_mode=S_IFREG|0644, st_nlink=1, st_uid=0, st_gid=0, st_blksize=4096, st_blocks=8, st_size=171, st_atime=2015/10/17-04:53:56, st_mtime=2015/10/17-04:53:54, st_ctime=2015/10/17-04:53:54}) = 0 <0.000008>
open("/etc/hosts", O_RDONLY|O_CLOEXEC)  = 3 <0.000009>
fstat(3</etc/hosts>, {st_dev=makedev(8, 1), st_ino=1161, st_mode=S_IFREG|0644, st_nlink=1, st_uid=0, st_gid=0, st_blksize=4096, st_blocks=8, st_size=251, st_atime=2015/10/16-18:57:29, st_mtime=2014/10/03-01:16:42, st_ctime=2014/10/03-01:16:42}) = 0 <0.000005>
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fed9385c000 <0.000008>
read(3</etc/hosts>, "127.0.0.1 localhost\n\n# The follo"..., 4096) = 251 <0.000009>
read(3</etc/hosts>, "", 4096)           = 0 <0.000007>
close(3</etc/hosts>)                    = 0 <0.000007>
munmap(0x7fed9385c000, 4096)            = 0 <0.000010>
socket(PF_INET, SOCK_STREAM, IPPROTO_IP) = 3 <0.000012>
fcntl(3<socket:[78362]>, F_SETFL, O_RDONLY|O_NONBLOCK) = 0 <0.000006>
connect(3, {sa_family=AF_INET, sin_port=htons(9000), sin_addr=inet_addr("127.0.0.1")}, 16) = -1 EINPROGRESS (Operation now in progress) <0.000094>
select(4, [3<socket:[78362]>], [3<socket:[78362]>], [3<socket:[78362]>], {0, 200000}) = 1 (out [3], left {0, 199997}) <0.000010>
getpeername(3, {sa_family=AF_INET, sin_port=htons(9000), sin_addr=inet_addr("127.0.0.1")}, [16]) = 0 <0.000007>
fcntl(3<socket:[78362]>, F_SETFL, O_RDONLY) = 0 <0.000006>
setsockopt(3, SOL_TCP, TCP_NODELAY, "\1\0\0\0\0\0\0\0", 8) = 0 <0.000008>
write(3<socket:[78362]>, "478\0<?xml version=\"1.0\" encoding"..., 483) = 483 <0.000042>
brk(0x2f93000)                          = 0x2f93000 <0.000472>
recvfrom(3, 0x7ffc489b16d0, 128, 0, 0, 0) = ? ERESTARTSYS (To be restarted if SA_RESTART is set) <4.940291>
--- SIGWINCH {si_signo=SIGWINCH, si_code=SI_KERNEL} ---
recvfrom(3, 0x7ffc489b16d0, 128, 0, 0, 0) = ? ERESTARTSYS (To be restarted if SA_RESTART is set) <0.072574>
--- SIGWINCH {si_signo=SIGWINCH, si_code=SI_KERNEL} ---
recvfrom(3, 0x7ffc489b16d0, 128, 0, 0, 0) = ? ERESTARTSYS (To be restarted if SA_RESTART is set) <0.033758>
--- SIGWINCH {si_signo=SIGWINCH, si_code=SI_KERNEL} ---
recvfrom(3, 0x7ffc489b16d0, 128, 0, 0, 0) = ? ERESTARTSYS (To be restarted if SA_RESTART is set) <0.038904>
--- SIGWINCH {si_signo=SIGWINCH, si_code=SI_KERNEL} ---
recvfrom(3, 0x7ffc489b16d0, 128, 0, 0, 0) = ? ERESTARTSYS (To be restarted if SA_RESTART is set) <0.026003>
--- SIGWINCH {si_signo=SIGWINCH, si_code=SI_KERNEL} ---
recvfrom(3, 0x7ffc489b16d0, 128, 0, 0, 0) = ? ERESTARTSYS (To be restarted if SA_RESTART is set) <0.024057>
--- SIGWINCH {si_signo=SIGWINCH, si_code=SI_KERNEL} ---
recvfrom(3, 0x7ffc489b16d0, 128, 0, 0, 0) = ? ERESTARTSYS (To be restarted if SA_RESTART is set) <0.055221>
--- SIGWINCH {si_signo=SIGWINCH, si_code=SI_KERNEL} ---
recvfrom(3, 0x7ffc489b16d0, 128, 0, 0, 0) = ? ERESTARTSYS (To be restarted if SA_RESTART is set) <0.058240>
--- SIGWINCH {si_signo=SIGWINCH, si_code=SI_KERNEL} ---
recvfrom(3, 0x7ffc489b16d0, 128, 0, 0, 0) = ? ERESTARTSYS (To be restarted if SA_RESTART is set) <0.027569>
--- SIGWINCH {si_signo=SIGWINCH, si_code=SI_KERNEL} ---
recvfrom(3, 0x7ffc489b16d0, 128, 0, 0, 0) = ? ERESTARTSYS (To be restarted if SA_RESTART is set) <0.056877>
--- SIGWINCH {si_signo=SIGWINCH, si_code=SI_KERNEL} ---
recvfrom(3, 0x7ffc489b16d0, 128, 0, 0, 0) = ? ERESTARTSYS (To be restarted if SA_RESTART is set) <0.025934>
--- SIGWINCH {si_signo=SIGWINCH, si_code=SI_KERNEL} ---
recvfrom(3, 0x7ffc489b16d0, 128, 0, 0, 0) = ? ERESTARTSYS (To be restarted if SA_RESTART is set) <0.076699>
--- SIGWINCH {si_signo=SIGWINCH, si_code=SI_KERNEL} ---
recvfrom(3, 0x7ffc489b16d0, 128, 0, 0, 0) = ? ERESTARTSYS (To be restarted if SA_RESTART is set) <0.089092>
--- SIGWINCH {si_signo=SIGWINCH, si_code=SI_KERNEL} ---
recvfrom(3, 0x7ffc489b16d0, 128, 0, 0, 0) = ? ERESTARTSYS (To be restarted if SA_RESTART is set) <0.254680>
--- SIGWINCH {si_signo=SIGWINCH, si_code=SI_KERNEL} ---
recvfrom(3, 0x7ffc489b16d0, 128, 0, 0, 0) = ? ERESTARTSYS (To be restarted if SA_RESTART is set) <0.131634>
--- SIGWINCH {si_signo=SIGWINCH, si_code=SI_KERNEL} ---
recvfrom(3, 0x7ffc489b16d0, 128, 0, 0, 0) = ? ERESTARTSYS (To be restarted if SA_RESTART is set) <0.065721>
--- SIGWINCH {si_signo=SIGWINCH, si_code=SI_KERNEL} ---
recvfrom(3, 0x7ffc489b16d0, 128, 0, 0, 0) = ? ERESTARTSYS (To be restarted if SA_RESTART is set) <0.042778>
--- SIGWINCH {si_signo=SIGWINCH, si_code=SI_KERNEL} ---
recvfrom(3, 0x7ffc489b16d0, 128, 0, 0, 0) = ? ERESTARTSYS (To be restarted if SA_RESTART is set) <0.072277>
--- SIGWINCH {si_signo=SIGWINCH, si_code=SI_KERNEL} ---
recvfrom(3, 0x7ffc489b16d0, 128, 0, 0, 0) = ? ERESTARTSYS (To be restarted if SA_RESTART is set) <0.044424>
--- SIGWINCH {si_signo=SIGWINCH, si_code=SI_KERNEL} ---
recvfrom(3, 0x7ffc489b16d0, 128, 0, 0, 0) = ? ERESTARTSYS (To be restarted if SA_RESTART is set) <0.080704>
--- SIGWINCH {si_signo=SIGWINCH, si_code=SI_KERNEL} ---
recvfrom(3, 0x7ffc489b16d0, 128, 0, 0, 0) = -1 ECONNRESET (Connection reset by peer) <113.777721>

Here is the contents of /etc/hosts :

127.0.0.1 localhost

# The following lines are desirable for IPv6 capable hosts
::1 ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
ff02::3 ip6-allhosts
127.0.1.1 homestead homestead

The contents of /etc/resolve.conf :

# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
nameserver 10.0.2.3

The problem is now affecting EVERY unrelated vagrant box I have, not just the Homestead box. Almost every PHP command on each box is stalled by 5-15 minutes for each CLI execution. If a chain of commands must be called, it can take an hour to finish a process that should take 30 seconds.

This started after the Mac these boxes are run on was upgraded to El Capitan.

Depending on the vagrant box, sometimes this strace line:

connect(3, {sa_family=AF_INET, sin_port=htons(9000), sin_addr=inet_addr("127.0.0.1")}, 16) = 0

Is replaced by:

connect(3, {sa_family=AF_INET, sin_port=htons(9000), sin_addr=inet_addr("192.168.56.1")}, 16) = 0

The IP 192.168.56.1 appears to be the default router for VirtualBox.

Please note, all vagrant boxes are either standard config or those that work without issue on my other team member's Mac/Windows systems.

Vagrant 1.7.4 and VirtualBox 4.3.30.

In response to request route -n :

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         10.0.2.2        0.0.0.0         UG    0      0        0 eth0
10.0.2.0        0.0.0.0         255.255.255.0   U     0      0        0 eth0
192.168.10.0    0.0.0.0         255.255.255.0   U     0      0        0 eth1

Results for sudo netstat -tulnp | grep 9000 sudo netstat -tulnp | grep 9000 :

tcp6       0      0 :::9000                 :::*                    LISTEN      1317/hhvm

Why hhvm is showing up, I don't know, because the box is supposed to be using the standard PHP interpreter.

Answer 1

Problem seems related to hostname resolve. if you are trying use your ip instead of localhost ip 127.0.0.1 . better to use in /etc/hosts like :

yourip  hostname.example.com hostname

for example

10.0.2.20 test.example.com test

and remove localhost related from /etc/hosts or keep at last. system will try to take first entry and if you are not using ipv6 then you can remove ipv6 related entry also.

EDIT: your /etc/resolv.conf file should have bellow line

nameserver 127.0.0.1

also add vagrant default network because your output shows it trying to connect that but if you don't want to use then you can skip. you are using 127.0.0.1 so at least it should be there.you can take help for changing from here and here .

Answer 2

tl;dr : I blame xdebug client. Try to disable xdebug on Ubuntu.

My rationale :

I don't see any problems with host resolution in the strace log there.

It checks /etc/resolv.conf first, then /etc/hosts and connects to 127.0.0.1:9000 connect(3, {sa_family=AF_INET, sin_port=htons(9000), sin_addr=inet_addr("127.0.0.1")}, 16) = -1 EINPROGRESS (Operation now in progress) <0.000094>

Port 9000 is the default for xdebug, unless redefined in /etc/php5/mods-available/xdebug.ini or similar.

write(3<socket:[78362]>, "478\\0<?xml version=\\"1.0\\" encoding"..., 483) = 483 <0.000042> looks like a message sent from xdebug extension to the client.

It waits for 2 minutes recvfrom(3, 0x7ffc489b16d0, 128, 0, 0, 0) = ? ERESTARTSYS recvfrom(3, 0x7ffc489b16d0, 128, 0, 0, 0) = ? ERESTARTSYS , then gives up and execute your php script.

The wait time has been reduced to 200 ms since v2.2.4: https://github.com/xdebug/xdebug/pull/90

Assuming that disabling of xdebug resolve the problem, there are few options:

• upgrade xdebug
• configure xdebug to start on-demand only with xdebug.remote_autostart=off
• keep enabling/disabling xdebug
• keep xdebug client always on and ensure ports are mapped correctly and it does not hung

Answer 3

Well it feels like a DNS problem. My guess would be either your machine can't resolve DNS via the given host name, or the DNS server is just slow. My advice would be to install a caching DNS server locally, and use that, and add to the /etc/hosts file anything in a private network, that won't be served from DNS. Use NetworkManager or whichever network service you have to add 127.0.0.1 as a viable (and preferred) DNS server, and things should work smoothly. If you're using ubuntu, that should be as easy as sudo apt-get install bind9.

If you want to diagnose the problem, first install dnsutils, to get dig and nslookup, and try querying something, like www.google.co.uk, see how long it takes and which server is authoritative. Then try using dig, to be more specific, interrogate the server directly, interrogate the SOA directly, see if you can figure out where the weakest link is.

It's probably a router that's advertising itself as DNS service via DHCP, but isn't working right when pressed.