
零七年第一篇文字 Blog,就是想當年了,實是有夠老氣橫秋。今次講一首歌。
話說當年亞視取得了國內央視的大型製作電視劇集版本《三國演義》的播映權,還請來馮兩努來每集解說,細數三國的種種。一時間還帶來了一陣「古裝
I've recently spent some time thinking about virtualization technology,in particular how I feel about Xen versus VMware. In theory the choiceshould be a slamdunk for me, because VMware requires evil binary kernelmodules and I have usually avoided that sort of thing even when it wassomewhat painful (eg, I don't use ATI's binary X drivers). In practice,though, I am only distantly lukewarm on Xen and much more interested inVMware.
The simple summary why this is is that Xen is
Presented in illustrated form, on at least Solaris 8, FreeBSD, andOpenBSD:
$ exec 9>/dev/null$ exec 10>/dev/nullexec: 10: not found
(And the shell exits.)
The genuine Bourne shell only allows redirection to (or from)single-digit file descriptors; if you give multiple digits, itinstead gets parsed as ' exec 10 >/dev/null '.
(The limitation has been faithfully copied by at least some Bourne shell
We have historically had a small problem with our inetd s: every sooften when we attempted to restart it with a SIGHUP to make it pick up aconfiguration change, it would fail to bring up an important UDP-basedservice we need, reporting a failure to bind to the UDP port.
(We saw the same problem with xinetd ; I'm using ' inetd ' as as ageneric term.)
What was probably happening is that when this would happen, inetd hadjust spawned the program to handle

零七年第一篇文字 Blog,就是想當年了,實是有夠老氣橫秋。今次講一首歌。
話說當年亞視取得了國內央視的大型製作電視劇集版本《三國演義》的播映權,還請來馮兩努來每集解說,細數三國的種種。一時間還帶來了一陣「古裝
Our central mail machine runs various cron jobs as part of its work.Starting recently, every now and then a cron job (or a command run outof an alias) would randomly die with an error like:
sh: /cs/foo/adm/script: cannot execute
(Where /cs/foo is NFS mounted through the automounter, and the cronentry just runs that script.)
I am pretty sure that this is a gift from the Solaris 8 automounter.
Our central mail machine is pretty old