Notes

Two types of companies: those that outsource operations to someone else vs those that manage themselves. Latter should be better but they won’t support a lot of locations. If we move abroad, better to choose a location that doesn’t have state income taxes, otherwise use same state as ours. Good services: https://travelingmailbox.com/ - seems to be the most bang for the buck. You can probably mark mails as junk after they are scanned and they won’t count towards monthly limits. Also, 2 months per year free. https://www.virtualpostmail.com/ https://www.earthclassmail.com/ https://sbimailservice.com https://www.usglobalmail.com

A few months back, I realized that I will learn deep learning better by working on real world projects as opposed to just doing exercises from a book. Then, when I wanted to go deeper into distributed systems, I decided to implement the algorithms to make them stick. That wasn’t a bad idea. For example, I implemented consistent hashing and hierarchical timing wheels and it was a great way to learn. However, coding takes effort and I kept putting off more stuff, such as rate limiting or consensus algorithms, because of the heavy cognitive effort. In such situations, I get rigid about how I want to do something. When that idea stops working, I continue to stick to it at the cost of making further progress. ...

The problems of distributed state machines and distributed logs are essentially the same. 3 roles: leader, follower and candidate. Only 2 RPC APIs in the algorithm. RequestVotes and AppendEntries (which also serves as heartbeats from leader to followers). Terms are tied to leadership changes, not with time. There can be terms that don’t have any leader because of election failures. Log indices change with commands from clients. So, multiple indices in sequence could have the same term. Leader is always right. So, it can change old log entries on other nodes. However, during election, the algorithm tries to elect a leader that is most up to date. Invariant: if, at an index, term number is the same between two nodes, everything before it should also be so. If nodes find discrepancies during replication, they reject the AppendEntries call from the leader and it’s the latter’s responsibility to retry for smaller indices. So, just those two APIs in the system. (Followers don’t make any API calls to resolve discrepancies.) During election, node will vote for a candidate only if the latter has a more complete log, which is defined by: 1) higher term and 2) higher log index, in sequence. 2 different majorities will contain at least 1 common member. While obvious, this has an important implication. If 2 different leaders are elected in sequence, at least 1 node will be common between those that voted for them. Open questions: ...

Paxos Paxos is notorious for being difficult to understand. However, the vanilla version seems somewhat straightforward albeit with one limitation: it only allows you to reach consensus on one value. For practical purposes, you want to reach consensus for multiple values in sequence, similar to a replicated log, and you need multi-Paxos for that. And that is hard. Think of basic Paxos as: “do we know already where we’ll go for dinner” and, if not, “let’s go for burgers”. Three roles: proposers, acceptors and learners. Odd number of acceptors. While both proposers and acceptors use numbers in the algorithm, those are just mechanisms to reach consensus on one value. Once consensus is reached, they can continue using more numbers but that value will never change. So, one run of the algorithm gets you one consensus value. If you want more, use multi-Paxos. The algorithm, the way I understand it, is as follows: ...

Create an archival script .rsync-archival-script.sh should look something like the following. Also, do a chmod +x .rsync-archival-script.sh. #!/bin/sh CMD=/usr/bin/rsync SRC=/media/unencrypted_drive/SharedFolder/ DST_NAMESPACE=raspberry-pi EXCLUDES_LOC=/tmp/rsync-homedir-excludes.txt wget https://raw.githubusercontent.com/rubo77/rsync-homedir-excludes/master/rsync-homedir-excludes.txt -O $EXCLUDES_LOC cat >> $EXCLUDES_LOC << 'EOF' .Trash ._* /Library ParkingSpace EOF DST=$DST_NAMESPACE$SRC ssh [email protected] mkdir -p $DST echo BEGIN `date` # TODO: check `-og` parameters as well. $CMD \ -azPH \ --exclude-from=$EXCLUDES_LOC \ --delete-excluded \ --xattrs \ --acls \ $SRC [email protected]:$DST curl -fsS -m 10 --retry 5 -o /dev/null https://hc-ping.com/.../$? echo END `date` Schedule the script Install this by running crontab -e on Raspberry Pi: ...

The following is a copy of the basic tutorial that rsync.net sent over to me when I signed up for their service. The login information above provides everything you need to access your filesystem, however some examples may be helpful: scp /some/file [email protected]: rsync -avz /some/file [email protected]: Yes, the trailing ':' at the beginning of the remote path IS necessary. Note in these two examples that you do NOT need to specify a home, or "starting" directory. If you wish to specify the location of a remote directory in your rsync.net account, you do it WITHOUT a preceding '/': scp /some/file [email protected]:some/directory/tree OR: rsync -avz /some/file [email protected]:other/dir/tree If you are simply connecting via FTP or SFTP, nothing is needed but the username and hostname: ftp [email protected] sftp [email protected] ----- This email has been sent in clear text, so you should immediately change your password. UNIX, Linux and Mac OS X users can do this in the terminal: ssh -t [email protected] passwd Windows users may set their password the same way, using the 'plink' command on the command line: https://www.rsync.net/resources/howto/windows_plink.html Please also note that the password for the web based login (mentioned below) needs to be updated separately from within the Account Manager interface. Your Account Manager and storage account passwords are not linked. ----- Configuration and settings of your account, including: account size, geo-redundancy, idle alerts and billing can all be managed with our web based account manager: https://www.rsync.net/am/dashboard.html?u=de1682 You can also view your quota and run simple UNIX commands over SSH: ssh [email protected] quota For a list of all commands that you can run over SSH, please see: https://www.rsync.net/resources/howto/remote_commands.html Windows users can run these same commands using the 'plink' command: https://www.rsync.net/resources/howto/windows_plink.html ----- Your home directory contains a .ssh directory that you can place an authorized_keys file in, which will allow you to interact with your filesystem in an automated fashion. There is a detailed HOWTO on this topic here: https://rsync.net/resources/howto/ssh_keys.html ----- rsync.net automatically creates and maintains 7 days of snapshots, or versions, for you. If you require more than 7 days (or 7 days + 4 weeks for 10+ TB accounts) please contact [email protected]. You can read more about our filesystem snapshots here: https://www.rsync.net/resources/howto/snapshots.html ----- If you are backing up data to your filesystem directly from a NAS, please contact us first so that we may properly configure your filesystem to work with your NAS. ----- If you need to use borg 1.x we recommend running your command as follows: borg COMMAND --remote-path=borg1 ... No special options are required to run borg 0.x ----- You can verify our SSH key fingerprints here: https://www.rsync.net/resources/fingerprints.txt ----- Basic usage examples can be found at https://www.rsync.net/resources/index.html Again, we are very happy to have you as a customer and look forward to serving you in any way that we can. -- The rsync.net Team - [email protected]

Probably go to gym in afternoon and keep early mornings for deep work. Prepare everything for next day’s morning beforehand. I should also know what I am going to work on. Can I prepare coffee too somehow?

This tool allows you to setup Symantec VIP tokens in Authy (or similar Google Authenticator apps): https://github.com/dlenski/python-vipaccess Use -t SYMC because that’s what I saw generated in the official iOS app. Essential commands: # Installation sudo apt install qrencode python3 -m venv env source env/bin/activate pip install python-vipaccess # Setup vipaccess provision -p -t SYMC qrencode -t UTF8 otpauth://totp/... While the instructions on the GitHub link were sufficient, you can refer to the following as additional reference: ...

https://www.indianhealthyrecipes.com/tandoori-chicken-recipe/ 2 tsp red chili powder. Maybe twice salt. Bake at 475 F for 10 mins on each side, if I were using chicken thights. However, be careful as this is too hot. Didn’t have too much success with this though because the chicken would turn out over-cooked.

For me, the exit node feature of Tailscale didn’t work, at least on Ubuntu, until I ran the following command: sudo ip6tables -t nat -A POSTROUTING -j MASQUERADE