menda - Developer IT

Last matching symbol in Regex

- by Menda

I couldn't find a more descriptive title, but here there is an example: import re m = re.search(r"$(?P<remixer>.+) (Remix)$", "Title (Menda Remix)") m.group("remixer") # returns 'Menda' OK m = re.search(r"$(?P<remixer>.+) (Remix)$", "Title (Blabla) (Menda Remix)") m.group("remixer") # returns 'Blabla) (Menda' FAIL This regex finds the first parenthesis, and I would like to match the last parenthesis for always getting 'Menda'. I've made a workaround to this using extra functions, but I would like a cleaner and a more consistent way using the same regex. Thanks a lot guys.

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SSD I/O extremely slow installing/booting Ubuntu 12.04

- by Menda

These are some useful specs: Macbook Pro 7,1 OWC Mercury Extreme Pro 2,5" SATA SSD (120 GB). Has SandForce driver. Ubuntu 12.04 Desktop 32 bits. One 18 GB partition for GNU/Linux and 1.5 GB for SWAP. MD5 for the Ubuntu install CD is OK. I tried to install Ubuntu. It seems that everything is recognized, but there's a big problem: read and writes to the SSD are extremely slow. For example, the install process, which shouldn't take more than 20 minutes, it takes 7 hours. Then, booting up the computer takes about 20 minutes. I checked and the problem is definitely the SSD. Every access to any file is like 10 times slower than normal. I have tried to format the partition as Ext4 and Ext3 with the same problem. Trying to install other distros like Fedora 17, I have a similar problem. There's a "lag" with the SSD, but not so accused as in Ubuntu. Surprisingly, Debian 6.0 installs and works without any problem. Mac OS works pretty good as well in the other partition, so I discard it's an SSD problem. Thanks for your help!

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FTP through HAProxy

- by Menda

I have a machine, which is the Host and has HAProxy installed in it and working. Then I have a Guest KVM virtual machine running inside the Host with an IP 192.168.122.152. I installed an FTP server in the Guest machine with VSFTPD. From the Host, if I try the command $ ftp -p 192.168.122.152, works perfectly and I can connect to the Guest FTP. I need to remark that this FTP is configured as passive, but both passive and active connections are working from the Host. This is an extract of part of /etc/vsftpd.conf in the Guest: # Passive mode connect_from_port_20=NO tcp_wrappers=YES listen_address=192.168.122.152 pasv_enable=YES pasv_promiscuous=NO port_enable=YES port_promiscuous=NO pasv_max_port=10000 pasv_min_port=10250 Now it's time to make it accessible from outside, so I configure /etc/haproxy/haproxy.cfg like this: listen FTP_Default *:21 server ftp01 192.168.122.152 check port 21 inter 10s rise 1 fall 2 listen FTP_Range *:10000-10250 server ftp01 192.168.122.152 check port 21 inter 10s rise 1 fall 2 But if I try to connect from other machine in internet $ ftp -p $PUBLICIP, it only responds: Connected to <PUBLICIP>, but it doesn't ask for the login and password. Something in the HAProxy config must be wrong, because it's the only point where it fails. By the way, I tried to adapt my configuration to this one in this blog. Thanks.

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HAProxy "503 Service Unavailable" for webserver running on a KVM virtual machine

- by Menda

I'm setting up a server with KVM (IP 192.168.0.100) and I have created inside of it one virtual machine using network bridging at 192.168.0.194. This virtual machine has an nginx instance running, which I can access from the server or from any computer computer in the internal network just typing in the browser http://192.168.0.194. However, I try configure HAProxy in the same server that hosts KVM and looking the status page of HAProxy it always shows the virtual machine as "DOWN". If I try from the server http://localhost, it should be the same than if I go to http://192.168.0.194. My goal is to build a reverse proxy, but I tried this little example and won't work. What am I doing bad? This is my config file in the server: # /etc/haproxy/haproxy.cfg global maxconn 4096 user haproxy group haproxy daemon defaults log global mode http option httplog option dontlognull retries 3 option redispatch maxconn 2000 contimeout 5000 clitimeout 50000 srvtimeout 50000 listen ServerStatus *:8081 mode http stats enable stats auth haproxy:haproxy listen Server *:80 mode http balance roundrobin cookie JSESSIONID prefix option httpclose option forwardfor option httpchk HEAD /check.txt HTTP/1.0 server mv1 192.168.0.194:80 cookie A check Thanks.

Developer IT