{"id":139,"date":"2013-01-28T21:53:16","date_gmt":"2013-01-28T20:53:16","guid":{"rendered":"\/wordpress\/?p=139"},"modified":"2013-01-28T21:53:16","modified_gmt":"2013-01-28T20:53:16","slug":"diskless-var","status":"publish","type":"post","link":"\/wordpress\/freebsd\/diskless-var\/","title":{"rendered":"Diskless \/var"},"content":{"rendered":"

On root filesystems that’s served from flash memory it may be advisable to keep off heavy writes from them. By putting \/var on a ramdrive you can greatly increase the expected lifetime of an ssd or a usb memorystick.<\/p>\n

Initial steps<\/h3>\n

A snapshot of \/var needs to be created. On true diskless systems FreeBSD ramdrive filesystems can be set up by populating \/conf\/base. While it won’t be supported in this case, it might prove a good idea to use the same base for this purpose.
\nStart off by creating an initial snapshot of \/var<\/p>\n

mkdir -p \/conf\/base\/var\r\ntar -cf \/conf\/base\/var.cpio.gz -C \/ --format cpio --gzip var<\/code><\/pre>\n
The contents on disk of \/var is now obsolete.<\/p>\n
rm -rf \/var\/*<\/code><\/pre>\n
Configuration<\/h3>\n
\/etc\/rc.conf<\/h4>\n
mdconfig_md0=\"-t swap -s 64m\"\r\nmdconfig_md0_cmd=\"tar -xpz -C \/ -f \/conf\/base\/var.cpio.gz\"<\/code><\/pre>\n
\/etc\/fstab<\/h4>\n
\/dev\/md0 \/var ufs rw,noauto 0 0<\/code><\/pre>\n
\/etc\/rc.shutdown.local<\/h4>\n
Whenever the system is shutdown, the snapshot must be updated with the current contents.<\/p>\n
mv \/conf\/base\/var.cpio.gz \/conf\/base\/var.cpio.gz.old\r\ntar -cf \/conf\/base\/var.cpio.gz -C \/ --format cpio --gzip var<\/code><\/pre>\n
The above would also prove useful in crontab to safeguard for brownouts or system crashes. So add the following to root’s crontab.<\/p>\n
0 * * * * \/bin\/sh \/etc\/rc.shutdown.local<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
On root filesystems that’s served from flash memory it may be advisable to keep off heavy writes from them. By putting \/var on a ramdrive you can greatly increase the expected lifetime of an ssd or a usb memorystick. Initial steps A snapshot of \/var needs to be created. On true diskless systems FreeBSD ramdrive …<\/span> Read More →<\/span><\/a><\/span><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[14],"tags":[31,35,11,36,37],"_links":{"self":[{"href":"https:\/\/wp.strahlert.net\/wordpress\/wp-json\/wp\/v2\/posts\/139"}],"collection":[{"href":"https:\/\/wp.strahlert.net\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wp.strahlert.net\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wp.strahlert.net\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/wp.strahlert.net\/wordpress\/wp-json\/wp\/v2\/comments?post=139"}],"version-history":[{"count":2,"href":"https:\/\/wp.strahlert.net\/wordpress\/wp-json\/wp\/v2\/posts\/139\/revisions"}],"predecessor-version":[{"id":141,"href":"https:\/\/wp.strahlert.net\/wordpress\/wp-json\/wp\/v2\/posts\/139\/revisions\/141"}],"wp:attachment":[{"href":"https:\/\/wp.strahlert.net\/wordpress\/wp-json\/wp\/v2\/media?parent=139"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wp.strahlert.net\/wordpress\/wp-json\/wp\/v2\/categories?post=139"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wp.strahlert.net\/wordpress\/wp-json\/wp\/v2\/tags?post=139"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}