Google has 79 billion billion billion IPv6 addresses, is buying up massive amounts of dark fiber, and building a massive data center. Just what is Google up to?
Sometimes it is necessary to convert a MySQL table in an existing database. For example, I ran into this with the need to create relationships between tables through the foreign key. As it turned out, the default MySQL MyISAM engine does not support this. To create a link table must be of type InnoDB. But this is not a big problem, because you can convert the table. To convert a single table SQL query is enough (which can be done, for example, through phpmyadmin):
Recently I migrated all MyISAM tables to InnoDB for some WP sites of clients.
I saw some improvement in mysql performance, specially when editing posts. I think earlier parallel write on
wp_posts table were getting blocked because MyISAM do not support row-level locking.
Synnefo – Pithos – API: Incompatible with ‘Openstack object storage API’ for python-swiftclient – Openstack.
Synnefo Pithos declares, that a full compatible with ‘Openstack object storage API’. And what can be used with ANY cli client on this level (https://www.synnefo.org/docs/synnefo/latest/pithos.html).
…Pithos runs at the cloud layer and exposes the OpenStack Object Storage API to the outside
world, with custom extensions for syncing.
Any client speaking to OpenStack Swift can also be used to store objects
in a Pithos deployment…
It is lie in some cases ….
Configuring the Kernel for multicast
To use multicast, the kernel configuration requires the CONFIG_IP_MULTICAST option to be set.
Use ifconfig to enable and disable all-multicast mode. Disable promisc by running:
Here’s how your IPv6 address may include your MAC address. An example IPv6 address is something like this: – 2001:0db8:1:2:60:8ff:fe52:f9d8
– Take the last 64 bits (the host identifier) and add lead zeroes: 00:08ff:fe52:f9d8
– Cut “ff:fe” from the middle. (If these bytes are not there, then there’s no MAC address.)
– For the first byte: complement the second low-order bit (the universal/local bit; if ther bit is a 1, make it 0, and if it is a 0, make it 1) So: 0x00 (00000000) become 0x02 (00000010)
– “60:8ff:fe52:f9d8” now becomes “02:60:08:52:f9:d8”!
Privacy addressing is used to hide you MAC address from IPv6 (in statelesss cases). What Privacy addressing does is generate a random, temporary address that doesn’t contain your MAC address. Here’s how you enable Privacy addressing:
On Linux, to enable temporary addresses and make them preferred for outgoing connections:
# Enable IPv6 Privacy Extensions net.ipv6.conf.all.use_tempaddr = 2 net.ipv6.conf.default.use_tempaddr = 2 net.ipv6.conf.nic0.use_tempaddr = 2 ... net.ipv6.conf.nicN.use_tempaddr = 2
netsh inter ipv6 set privacy state=enabled
Only TCP_SYN from some nets
-> watch -n 300 'curl -I http://site.com:3080 2>/dev/null | egrep "HTTP|Date" | tee -a site.curl.txt'
script in root of WP
Technically better to provide a small override of service file rather than copying the whole new version in /etc/systemd/system … (www.freedesktop.org/software/systemd/man/systemd.unit.html)