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Full Discussion: cron/logrotate chicken and egg problem
Top Forums UNIX for Advanced & Expert Users cron/logrotate chicken and egg problem Post 302236924 by jjinno on Tuesday 16th of September 2008 02:59:22 PM
Old 09-16-2008
The results are in...
I did a comparative strace between a fully functioning system and a system with cron failure. The basics are the same...

A poling loop for config changes (repeated every minute):
Code:
stat("cron", {st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0
stat("/etc/cron.d", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
stat("/etc/crontab", {st_mode=S_IFREG|0644, st_size=255, ...}) = 0
rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
rt_sigaction(SIGCHLD, NULL, {0x555555557772, [], SA_RESTORER|SA_RESTART, 0x2aaaaae0a460}, 8) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
nanosleep({60, 0}, {60, 0})             = 0

After some reads to /etc/localtime (for logging) and a message send, the first /var interaction... connecting to a socket:
Code:
[pid 24735] socket(PF_FILE, SOCK_STREAM, 0) = 3
[pid 24735] fcntl(3, F_GETFL)           = 0x2 (flags O_RDWR)
[pid 24735] fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0
[pid 24735] connect(3, {sa_family=AF_FILE, path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory)
[pid 24735] close(3)                    = 0

Blah, blah, blah, some different libraries, a look at resolv.conf, and finally, the moment we have all been waiting for:
Code:
[pid 24735] socket(PF_INET, SOCK_DGRAM, IPPROTO_IP) = 3
[pid 24735] connect(3, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("10.20.30.40")}, 28) = 0
[pid 24735] fcntl(3, F_GETFL)           = 0x2 (flags O_RDWR)
[pid 24735] fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0
[pid 24735] poll([{fd=3, events=POLLOUT, revents=POLLOUT}], 1, 0) = 1
[pid 24735] sendto(3, "\377\276\1\0\0\1\0\0\0\0\0\0\7babylon5\7skynet\5loc"..., 39, MSG_NOSIGNAL, NULL, 0) = 39
[pid 24735] poll([{fd=3, events=POLLIN, revents=POLLIN}], 1, 5000) = 1
[pid 24735] ioctl(3, FIONREAD, [111])   = 0
[pid 24735] recvfrom(3, "\377\276\205\203\0\1\0\0\0\1\0\0\7babylon5\7skynet\5lo"..., 1024, 0, {sa_family=AF_INET, \
sin_port=htons(53), sin_addr=inet_addr("10.20.30.40")}, [16]) = 111
[pid 24735] writev(2, [{"crond", 5}, {": ", 2}, {"relocation error", 16}, {": ", 2}, {"/lib64/libresolv.so.2", 21}, {": ", 2}, \
{"symbol __res_iclose, version GLI"..., 97}, {"", 0}, {"", 0}, {"\n", 1}], 10 <unfinished ...>
[pid 24734] <... read resumed> "crond: relocation error: /lib64/"..., 4096) = 146
[pid 24735] <... writev resumed> )      = 146
[pid 24734] uname( <unfinished ...>
[pid 24735] exit_group(127)             = ?
Process 24735 detached

It does this once more, and then exits (on a Interrupted System Call) to resume the nanosleep loop...

Now, almost everything (except the error) is identical between the good and bad strace. The return code for the last recvfrom() is 91 on the good server, and 111 on the bad... also the sendto() returns 43 on the good server, and 39 on the bad...
 

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LEARN ABOUT CENTOS

yum-cron

yum-cron(8)															       yum-cron(8)

NAME

       yum-cron - an interface to convieniently call yum from cron

SYNOPSIS

       yum-cron [config-file]

DESCRIPTION

       yum-cron  is  an  alternate  interface to yum that is optimised to be convenient to call from cron.  It provides methods to keep repository
       metadata up to date, and to check for, download, and apply updates.  Rather than accepting many different command line arguments, the  dif-
       ferent functions of yum-cron can be accessed through config files.

       config-file  is	used  to optionally specify the path to the configuration file to use.	If it is not given, the default configuration file
       will be used.  It is useful to be able to specify different configuration files for different use cases.  For  example,	one  configuration
       file  might  be set to update the repository metadata, and a line could be added to the crontab to run yum-cron frequently using this file.
       Then, another configuration file might be set to install updates, and yum-cron could be run from cron using this file just once each day.

FILES

       /etc/yum/yum-cron.conf
       /etc/yum/yum-cron-hourly.conf

SEE ALSO

       yum (8)

AUTHORS

       See the Authors file included with this program.

BUGS

       There of course aren't any bugs, but if you find any, you should email
	the mailing list, yum@lists.baseurl.org, or consult bugzilla.

Nick Jacek															       yum-cron(8)
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