Changes between Initial Version and Version 1 of marcos.mayfirst.org

Timestamp:

Mar 21, 2008, 4:24:17 PM (16 years ago)

Author:

Daniel Kahn Gillmor

Comment:

--

marcos.mayfirst.org

@@ +1 @@
+= `marcos.mayfirst.org` =
+
+`marcos.mayfirst.org` is a simple xen domU hosting a dedicated resolving DNS cache for MF/PL.  It was created in response to #765.
+
+It is hosted on [wiki:fred.mayfirst.org].
+
+== Creation ==
+
+I opted to go with debian lenny, since the new [DebianPackage:djbdns] packages are included upstream, and there will be no other services on the box.
+
+{{{
+0 fred:~# lvcreate --name marcos-disk --size 500M vg_fred0
+  Logical volume "marcos-disk" created
+0 fred:~# mkfs -t ext3 /dev/mapper/vg_fred0-marcos--disk 
+mke2fs 1.40-WIP (14-Nov-2006)
+Filesystem label=
+OS type: Linux
+Block size=1024 (log=0)
+Fragment size=1024 (log=0)
+128016 inodes, 512000 blocks
+25600 blocks (5.00%) reserved for the super user
+First data block=1
+Maximum filesystem blocks=67633152
+63 block groups
+8192 blocks per group, 8192 fragments per group
+2032 inodes per group
+Superblock backups stored on blocks: 
+        8193, 24577, 40961, 57345, 73729, 204801, 221185, 401409
+
+Writing inode tables: done                            
+Creating journal (8192 blocks): done
+Writing superblocks and filesystem accounting information: done
+
+This filesystem will be automatically checked every 21 mounts or
+180 days, whichever comes first.  Use tune2fs -c or -i to override.
+0 fred:~# mount /dev/mapper/vg_fred0-marcos--disk /mnt/
+0 fred:~# debootstrap lenny /mnt/
+I: Retrieving Release
+I: Retrieving Packages
+I: Validating Packages
+I: Resolving dependencies of required packages...
+I: Resolving dependencies of base packages...
+I: Found additional base dependencies: libldap-2.4-2 
+I: Checking component main on http://ftp.debian.org/debian...
+I: Retrieving adduser
+ ...[skip boring debootstrap output]...
+I: Configuring klogd...
+I: Configuring tasksel...
+I: Base system installed successfully.
+0 fred:~# echo proc /proc proc defaults 0 0 > /mnt/etc/fstab 
+0 fred:~# echo /dev/sda1 / ext3 defaults,errors=remount-ro 0 1 >> /mnt/etc/fstab
+0 fred:~# echo /dev/sda2 none swap sw 0 0 >> /mnt/etc/fstab
+0 fred:~# echo >/mnt/etc/hosts '127.0.0.1 localhost
+209.51.163.29 marcos.mayfirst.org marcos
+
+# The following lines are desirable for IPv6 capable hosts
+::1     ip6-localhost ip6-loopback
+fe00::0 ip6-localnet
+ff00::0 ip6-mcastprefix
+ff02::1 ip6-allnodes
+ff02::2 ip6-allrouters
+ff02::3 ip6-allhosts
+'
+0 fred:~# echo marcos > /mnt/etc/hostname 
+0 fred:~# cp -a {,/mnt}/etc/network/if-up.d/add-he-routes 
+0 fred:~# cp -a {,/mnt}/etc/network/if-down.d/remove-he-routes
+0 fred:~# emacs /mnt/etc/network/if-*.d/*-he-routes ## fix up to repair IP addresses and network interface designations
+0 fred:~# lvcreate --size=200MB --name=marcos-swap vg_fred0
+  Logical volume "marcos-swap" created
+0 fred:~# mkswap /dev/mapper/vg_fred0-marcos--swap 
+Setting up swapspace version 1, size = 209711 kB
+no label, UUID=1fe97b9d-445b-458c-891b-925d23dfaa80
+0 fred:~# umount /mnt
+0 fred:~# 
+}}}
+
+Setting up the xen config:
+{{{
+0 fred:~# grep '^[^#]' /etc/xen/marcos
+kernel  = '/boot/vmlinuz-2.6.18-6-xen-amd64'
+ramdisk = '/boot/initrd.img-2.6.18-6-xen-amd64'
+memory  = '64'
+root    = '/dev/sda1 ro'
+disk    = [ 'phy:vg_fred0/marcos-disk,sda1,w', 'phy:vg_fred0/marcos-swap,sda2,w' ]
+name    = 'marcos'
+vif  = [ 'ip=209.51.163.29' ]
+on_poweroff = 'destroy'
+on_reboot   = 'restart'
+on_crash    = 'restart'
+0 fred:~# 
+}}}
+
+Within the domU, once it was started, i did:
+{{{
+aptitude install iproute less lsof emacs22-nox psmisc screen runit djbdns
+}}}
+
+I don't appear to need the kernel modules for this machine, since it is a dedicated host.
+
+Setting up the actual resolving name service:
+{{{
+0 marcos:~# lsof -i
+1 marcos:~# adduser --system dnslog
+Adding system user `dnslog' (UID 100) ...
+Adding new user `dnslog' (UID 100) with group `nogroup' ...
+Creating home directory `/home/dnslog' ...
+0 marcos:~# adduser --system dnscache
+Adding system user `dnscache' (UID 101) ...
+Adding new user `dnscache' (UID 101) with group `nogroup' ...
+Creating home directory `/home/dnscache' ...
+0 marcos:~# dnscache-conf dnscache dnslog /srv/dnscache 209.51.163.29
+0 marcos:~# ln -s /srv/dnscache /etc/service
+0 marcos:~# lsof -i
+COMMAND   PID     USER   FD   TYPE DEVICE SIZE NODE NAME
+dnscache 1536 dnscache    3u  IPv4   4816       UDP marcos.mayfirst.org:domain 
+dnscache 1536 dnscache    4u  IPv4   4817       TCP marcos.mayfirst.org:domain (LISTEN)
+0 marcos:/srv/dnscache/root/ip# ip route
+209.51.163.192/28 dev eth0  scope link  src 209.51.163.29 
+209.51.180.16/28 dev eth0  scope link  src 209.51.163.29 
+209.51.172.0/28 dev eth0  scope link  src 209.51.163.29 
+209.51.169.80/28 dev eth0  scope link  src 209.51.163.29 
+209.51.163.0/27 dev eth0  proto kernel  scope link  src 209.51.163.29 
+default via 209.51.163.1 dev eth0 
+0 marcos:~# ls /srv/dnscache/root/ip/ | wc -l
+1
+0 marcos:~# for BASE in 209.51.163.192 209.51.180.16 209.51.172.0 209.51.169.80 209.51.163.0 209.51.163.16; do for INC in $(seq 0 15) ; do LAST=${BASE#*.*.*.}; NEW=/srv/dnscache/root/ip/${BASE%.*}.$(( $LAST + $INC )); if [ ! -e $NEW ]; then touch $NEW; fi; done; done
+0 marcos:~# ls /srv/dnscache/root/ip/
+97
+0 marcos:~# 
+}}}