pkg_add -r xorg xorg-fonts urwfonts freetype py27-xpyb
libXfontcache xdm portupgrade git bash emacs
chromium
xset m 12/4/8 xrdb -merge $HOME/.Xdefaults xsetroot -solid steelblue xterm & exec /usr/local/src/dim/bin/dim
portsnap fetch portsnap extract portsnap update pkg_install -r portupgrade portupgrade -R py27-xpyb
My organization is using RHEV which is a RedHat supported version of the Apache Licensed oVirt. Video.linux.com has videos teaching the use of the system including an introduction to oVirt architecture. RedHat also has ePub versions of 12 documents including their REST API documentation, which looks very promising for CLI and automation tasks. It has a nice GUI if you can stand IE; Firefox support is coming and the IE requirement is just a remnant of the company they bought to get RHEV, from whom they then released the source. A windows server is no longer required (just Tomcat and PostgreSQL). If you really can't stand a Windows VM you can go all CLI; just accept that behind the scenes it will be passing XML to the server and back.
We're still using Dell servers but are considering Cisco UCS. UCS attracted me because it offers flexibilities that standard servers don't seem to have, in particular the ability the manage physical machines like virtual machines. For example, automatically flash any subset of the servers with a variety of properties including: version x of the firmware, the mac address of the previous server running it so the OS can't tell the difference after a hardware upgrade, and to store and apply machines profiles like software. Also, we already have full Cisco network gear and the cabling for it is much simpler with just two 40G uplinks for a full chassis. Like the XIV and RHEV, it has a platform independent GUI as well as a CLI which is all based on the same XML API. With all of Cisco's talk of vmWare you might think they didn't know RHEV existed but RHEV is fully supported and tested by Cisco. UCS also has plugins for RHEV to integrate management. I can imagine using the similar API in a single script to orchestrate events on my SAN, Server, and Cluster manager and it seems attractive.
Below are some slides from a joint presentation from RedHat and Cisco on RHEV and UCS:
I've posted before about how our Cisco firewall tears down inactive connections and modifying the tcp_keepalive_time on the Linux kernel so as to not loose the connection. Similar options exist on the database side.
If you're running MySQL then update /etc/my.cnf to have:
wait_timeout=900If you're running an Oracle then update sqlnet.ora to have:
SQLNET.EXPIRE_TIME=10This option is in $ORACLE_HOME/network/admin/sqlnet.ora.
(Searching for program No such file or directory aspell)Here's a quick fix
(setenv "PATH" (concat (getenv "PATH") ":/usr/local/bin"))
(setq exec-path (append exec-path '("/usr/local/bin")))
The problem is that OS X doesn't come with a aspell or ispell by default so you can install it with Homebrew. Homebrew installs everything in /usr/local/ but GNU Emacs for OS X doesn't look there; i.e. it's not in its path, thus the two lines above add it to Emacs' path.
sh-4.2$ ipython Python 2.7.2 (default, Oct 27 2011, 01:40:22) Type "copyright", "credits" or "license" for more information. IPython 0.12 -- An enhanced Interactive Python. ? -> Introduction and overview of IPython's features. %quickref -> Quick reference. help -> Python's own help system. object? -> Details about 'object', use 'object??' for extra details. In [1]: 1+ File "", line 1 1+ ^ SyntaxError: invalid syntax In [2]: import ldap.<tab> ldap.async ldap.dn ldap.ldapobject ldap.sasl ldap.thread ldap.cidict ldap.filter ldap.modlist ldap.schema ldap.threading ldap.controls ldap.functions ldap.resiter ldap.sys ldap.traceback In [2]: import ldap.filter In [3]: ldap.filter.<tab> ldap.filter.escape_filter_chars ldap.filter.filter_format In [3]: ldap.filter.escape_filter_chars? Type: function Base Class: String Form: Namespace: Interactive File: /usr/lib64/python2.7/site-packages/ldap/filter.py Definition: ldap.filter.escape_filter_chars(assertion_value, escape_mode=0) Docstring: Replace all special characters found in assertion_value by quoted notation. escape_mode If 0 only special chars mentioned in RFC 2254 are escaped. If 1 all NON-ASCII chars are escaped. If 2 all chars are escaped. In [4]: In [4]: ldap.filter.escape_filter_chars?? Type: function Base Class: String Form: Namespace: Interactive File: /usr/lib64/python2.7/site-packages/ldap/filter.py Definition: ldap.filter.escape_filter_chars(assertion_value, escape_mode=0) Source: def escape_filter_chars(assertion_value,escape_mode=0): """ Replace all special characters found in assertion_value by quoted notation. escape_mode If 0 only special chars mentioned in RFC 2254 are escaped. If 1 all NON-ASCII chars are escaped. If 2 all chars are escaped. """ if escape_mode: r = [] if escape_mode==1: for c in assertion_value: if c < '0' or c > 'z' or c in "\\*()": c = "\\%02x" % ord(c) r.append(c) elif escape_mode==2: for c in assertion_value: r.append("\\%02x" % ord(c)) else: raise ValueError('escape_mode must be 0, 1 or 2.') s = ''.join(r) else: s = assertion_value.replace('\\', r'\5c') s = s.replace(r'*', r'\2a') s = s.replace(r'(', r'\28') s = s.replace(r')', r'\29') s = s.replace('\x00', r'\00') return s In [5]: ... In [60]: import string In [61]: string.<tab> string.Formatter string.capwords string.ljust string.rsplit string.Template string.center string.lower string.rstrip string.ascii_letters string.count string.lowercase string.split string.ascii_lowercase string.digits string.lstrip string.splitfields string.ascii_uppercase string.expandtabs string.maketrans string.strip string.atof string.find string.octdigits string.swapcase string.atof_error string.hexdigits string.printable string.translate string.atoi string.index string.punctuation string.upper string.atoi_error string.index_error string.replace string.uppercase string.atol string.join string.rfind string.whitespace string.atol_error string.joinfields string.rindex string.zfill string.capitalize string.letters string.rjust In [61]: string.whitespace Out[61]: '\t\n\x0b\x0c\r ' In [62]: string.punctuation Out[62]: '!"#$%&\'()*+,-./:;<=>?@[\\]^_`{|}~' In [63]:
Long have I looked forward to Zimbra having disaster recovery through server to server sync. It would have made things better in my organization in a DR situation. In lieu of not having this feature we live mirror replicate the Zimbra store server LUNs between data centrers on our XIVs. So our DR strategy is to use our backup store servers on the replicated LUNs. Setting this up would take some time. It would be much better if they were already in the Zimbra cluster all the time and flipping them over to be the master would be a "supported feature" not something a sys admin has to do by configuring another instance of the store server by using the same data.
Zimbra promised me this feature years ago and today they backed out and ask that we just implement this feature by running Zimbra on VMware and buying vCenter Site Recovery Manager. However, we don't want proprietary lock-in reaching down into our virtualization platform so we don't use VMware and instead use KVM. We like Zimbra because it's built with non-proprietary components aside from the active-sync and Outlook connectors which we liked having since lots of people want an Exchange-like interface and we can keep the proprietary code/protocols in their own little bucket.
Zimbra is calling lots of attention to VMware's features as opposed to what a future version of Zimbra was supposed to have:
"This enhancement requests asks to sync an active server to a passive server, we'll never do this. It's a legacy failover model when their are new technology options to provide elastic scaling and (geo)redundancy with stateless application servers and distributed data. It's taken some time for these technologies to progress to the point where they are viable enough for applications like Zimbra that need data consistency and atomic transactions."Let's look at this more simply. VMware can sync VM objects. Zimbra was supposed to be able to sync Zimbra objects. If you run Zimbra on VMware then you can just use the sync'd VMware objects for DR but if you don't run VMware then it would be nice to have sync'd Zimbra objects. Sycing objects to a recovery site is not legacy. What's changed is the type of objects.
Update: Zimbra re-opened the feature request. I'm glad the community put enough pressure on them.
rhel5 /proc/sys/net/ipv4/netfilter/ip_conntrack_tcp_be_liberal rhel6: /proc/sys/net/netfilter/nf_conntrack_tcp_be_liberal
When lowering the TTL I end up having to ask someone or look it up enough that I'm posting this cheat sheet for myself to search in the future. So if a longer TTL is inherited from the top of the zone file and foo.tld inherits that time it would look like the following:
foo A 123.456.7.8To lower it's TTL to one hour I simply insert the time with units (else it's seconds) in between the hostname and the A:
foo 1h A 123.456.7.8Then after reloading the zone file query that DNS server for the name:
dig @123.456.2.1 foo.bar.comand make sure the ANSWER section contains 3600, which is the number of seconds in an hour:
;; ANSWER SECTION: foo.tld. 3600 IN A 123.456.7.8
Nothingmuch's Migrating from Subversion to Git worked for me for two SVN repos that I'm actively working on.
Quick notes:
yum install git-svn git svn clone --prefix=svn/ --stdlayout --authors-file=authors.txtThis makes a clean git repo complete with tags, branches, and history. Now set the "central" repo location :git svn-abandon-fix-refs git svn-abandon-cleanup
git remote add originfinally, push it up to the server :git config branch.master.remote origin git config branch.master.merge refs/heads/master
git push origin master