Re: [CentOS] operation on the client is slow when openldap serversare down
nscd turned out to be very helpful. 2010-06-11 xufengnju 发件人： Dan Burkland 发送时间： 2010-06-10 21:49:38 收件人： CentOS mailing list 抄送： 主题： Re: [CentOS] operation on the client is slow when openldap serversare down From: centos-boun...@centos.org [mailto:centos-boun...@centos.org] On Behalf Of XUFENG Sent: Thursday, June 10, 2010 3:54 AM To: centos@centos.org Subject: [CentOS] operation on the client is slow when openldap servers are down Hi List, OS: centos5.3 x86_64 OpenLDAP is installed using yum. I find that when all the ldap servers are down and offline, the operations on the client is slow. When I try to do `ls` on the directories on the client as root, it waits there for some seconds.(root is not local account not via ldap) But when I power on the openldap servers, it is much better. The configuration on the client: [r...@ ~]# cat /etc/ldap.conf base dc=,dc=com timelimit 1 bind_timelimit 1 nss_initgroups_ignoreusers root,ldap,named,avahi,haldaemon,dbus,radvd,tomcat,radiusd,news,mailman,nscd,gdm uri ldaps://auth1.xa..com:636 ldaps://auth2.xa..com:636 ssl on tls_checkpeer yes tls_cacertdir /etc/openldap/cacerts tls_cacertfile /etc/openldap/cacerts/cacert.pem pam_password md5 bind_policy soft [r...@ ~]# cat /etc/openldap/ldap.conf URI ldaps://auth1.xa..com:636 ldaps://auth2.xa..com:636 BASE dc=,dc=com TLS_CACERTDIR /etc/openldap/cacerts TLS_CACERT /etc/openldap/cacerts/cacert.pem TLS_REQCERT demand [r...@ ~]# cat /etc/nsswitch.conf passwd: files ldap shadow: files ldap group: files ldap hosts: files dns bootparams: nisplus [NOTFOUND=return] files ethers: files netmasks: files networks: files protocols: files rpc:files services: files netgroup: files ldap publickey: nisplus automount: files ldap aliases:files nisplus Any suggestions? I don't know for sure if this will help any but have you tried nscd to cache results? -Dan ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] unison versus rsync
When you are ove a tunnel such as vpn connection, you can use it in daemon mode on one side and rsync to or from that side on the other side. Sounds like server/client application. 2010-01-14 xufengnju 发件人： Joseph L. Casale 发送时间： 2010-01-14 09:12:16 收件人： 'CentOS mailing list' 抄送： 主题： Re: [CentOS] unison versus rsync I didn't think unison was maintained any more - and I wouldn't expect anything to beat rsync with the -z option on a slow link. I'd just use the -P option and restart it when/if it fails. It wouldn't hurt to do subsets first since they will be quickly skipped when you repeat from the root. If you have a huge number of files it might be worth finding a way to update rsync to a 3.x version which will not need to xfer the entire directory listing before starting. Looks like rf has 3.0.7, thanks for that tip. Frankly, I abhor the thought of even using rsync for this, it's over a vpn so there is absolutely no need for encryption but I don't know another tool that can transfer diffs only? Thanks guys, jlc ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
[CentOS] rsync optimization
Hi, We currently have upload servers in one data center(A), and users upload the images there. We have storage server in another data center(B). When users upload many images at the same time, we face sync difficulties. On B, we use rsync in server mode, with authentication. On A, we use `rsync -azpogtRv --safe-links 1/ rsync://u...@serverb/img/ --password-file=/var/www/r.passwd ` Both ends run centos 5.3 X86_64. Any suggestions to optimize rsync in this case? Thank you in advance. 2010-01-11 xufengnju ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] rsync optimization
We are now doing on the work to reduce the amount of images that would be compared before rsync many of which maybe aready exist on the receiving end. After we do a successful rsync, we log the images transfered, and we use another script to delete them on the send end. And that turns out to be helpful in this case. 2010-01-12 xufengnju 发件人： Kwan Lowe 发送时间： 2010-01-11 21:14:58 收件人： CentOS mailing list 抄送： 主题： Re: [CentOS] rsync optimization On Mon, Jan 11, 2010 at 4:36 AM, xufengnju xufeng...@sina.com wrote: Hi, We currently have upload servers in one data center(A), and users upload the images there. We have storage server in another data center(B). When users upload many images at the same time, we face sync difficulties. On B, we use rsync in server mode, with authentication. On A, we use `rsync -azpogtRv --safe-links 1/ rsync://u...@serverb/img/ --password-file=/var/www/r.passwd ` Both ends run centos 5.3 X86_64. Any suggestions to optimize rsync in this case? You can add the following options: --ignore-times --delay-updates The first will speed up the comparison. The second can prevent some errors related to synchronization on the receiving side. BTW, have you considered using a DRBD volume with GFS? This might work better than rsync, depending on your configuration. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
